What if deku quirk was that he is unaffected by explosions?

 

The summer Izuku Midoriya turned four years old was defined by the relentless, droning hum of cicadas and the sharp, saccharine smell of burnt sugar. 

In the densely wooded parks of Musutafu, Japan, the world was vast, green, and ripe for conquest. To a child, these woods were not merely trees and dirt; they were unmapped continents, enemy fortresses, and battlegrounds where the heroes of tomorrow tested their mettle. And leading the charge, as he always did, was Katsuki Bakugo.

"Hurry up, Deku! If you fall behind, I’m leaving you to the villains!" Katsuki’s voice rang out, sharp and authoritative, carrying a natural command that seemed far too large for his small frame. He stood atop a moss-covered log bridging a shallow creek, a makeshift wooden sword gripped tightly in his hand. He looked every bit the conqueror, bathed in the dappled afternoon sunlight.

"I'm coming, Kacchan! Wait for me!" Izuku scrambled up the muddy embankment, his bright red shoes slipping slightly on the damp earth. He was smaller than Katsuki, rounder, with a mop of unruly green curls that bounced with every step. In his hand, he clutched an All Might action figure, holding it aloft like a talisman of protection. 

Even at four years old, the hierarchy was clear. Katsuki was the leader, the brave, the strong. Izuku was the follower, the quiet, the observer. But there was no malice in this arrangement, at least not yet. It was simply the natural order of their small universe. Izuku idolized Katsuki almost as much as he idolized All Might. Katsuki was the closest thing to a hero Izuku had ever seen in real life. 

That belief was cemented the day Katsuki’s quirk manifested.

It started as a subtle thing. A few days prior, while they were playing in the sandbox, Katsuki’s palms had begun to sweat profusely, and small, snapping sounds—like popping candy cracking against teeth—echoed from his hands. By the end of the week, those pops had evolved. 

Izuku remembered the exact moment Katsuki realized what he possessed. They were standing by the edge of the playground. Katsuki had clenched his fists, his face scrunched in concentration, and suddenly, a bright, golden-orange flash erupted from his right palm. The miniature detonation sent a sharp CRACK echoing across the park, followed immediately by a puff of acrid, sweet-smelling smoke.

The other children had gasped, their eyes wide with awe. Izuku had dropped his jaw, dropping his All Might figure into the dirt. 

"Woah..." Izuku had breathed, his emerald eyes reflecting the fading sparks. "Kacchan... your quirk... it’s amazing! It’s a hero’s quirk!"

Katsuki had grinned, staring down at his smoking palms with a look of pure, unadulterated triumph. The world had just handed him a crown, and he was more than ready to wear it. "Of course it is," Katsuki declared, puffing out his chest. "I’m going to be the number one hero. Even better than All Might!"

From that day on, Katsuki’s quirk was the center of their universe. He showed it off constantly. He used it to propel pebbles, to scorch leaves, to intimidate the older kids who tried to take their swing sets. The explosions grew slightly larger, slightly louder, fueled by Katsuki’s growing pride and the endless praise of the adults around him. Such a powerful quirk, the teachers would say. He’s definitely going to U.A. High School, the neighbors would whisper.

Izuku watched it all with shining eyes, waiting patiently for his own quirk to arrive. He imagined breathing fire like his father, or floating objects like his mother. Maybe he would get a combination of both! Flying and breathing fire—he would be unstoppable! He would stand right beside Kacchan, and together, they would be the greatest hero duo in history.

But weeks turned into months, and Izuku remained exactly the same. No fire. No floating. Just an ordinary boy with skinned knees and a notebook full of dreams.

The anxiety began to gnaw at him, a quiet, cold feeling in the pit of his stomach. What if he didn't get a quirk? What if he was left behind? The late bloomers in his kindergarten class were already starting to get impatient looks from the teachers. 

Then came the afternoon that changed everything.

It was a sweltering Tuesday in late August. The air was thick and heavy with humidity, the kind of weather that made tempers run short and energy levels spike erratically. Izuku and Katsuki were at the local playground, accompanied by a few other boys from their neighborhood. 

Katsuki was holding court, as usual. He was demonstrating a new trick he had learned: stringing together three small explosions in rapid succession to create a louder, more concussive bang. 

"Watch this," Katsuki commanded, stepping to the center of the rubber-mat playground. The other boys backed up, giving him a wide berth. Izuku stood at the front of the makeshift audience, his eyes wide, absorbing every detail. 

Katsuki planted his feet, grit his teeth, and thrust his hands forward. BANG! BANG! BANG! 

Bright orange fire flared, the shockwaves ruffling Izuku's green hair. The smell of caramelized nitroglycerin instantly flooded the humid air. The other boys cheered loudly.

"That's so cool, Bakugo!" one of the extras shouted. 

"You're like a walking firework!" yelled another.

Katsuki smirked, wiping a bead of sweat from his forehead. "That’s nothing. I bet I can make one twice as big. My mom says my sweat glands are getting bigger."

Izuku took a step forward, his natural curiosity overriding his usual timidity. "Kacchan, how does it work? Does it hurt your hands when they pop? Does the fire burn you?"

Katsuki scoffed, crossing his arms. "Of course it doesn't burn me, Deku! It's my quirk. My skin is tough. Only an idiot would get hurt by his own power."

"Can I see your hands?" Izuku asked eagerly, stepping even closer. He was now only a foot away from Katsuki. "I want to see where the sparks come from."

Katsuki rolled his eyes, but his vanity won out. He held out his hands, palms facing upward. Izuku leaned in close, his nose practically inches from Katsuki’s right palm. He could see the faint sheen of sweat glistening in the creases of the boy's skin.

"See?" Katsuki said impatiently. "It’s the sweat. I can make it explode whenever I want."

"Wow..." Izuku whispered, mesmerized. "It's like a tiny volcano."

Perhaps it was the heat of the day. Perhaps Katsuki’s four-year-old emotional regulation was simply exhausted. Or perhaps it was an involuntary reflex triggered by Izuku breathing warmly against his hyper-sensitive, sweat-slicked palm. 

Whatever the cause, Katsuki’s quirk misfired. 

He didn't mean to do it. He hadn't flexed his muscles or concentrated his intent. But suddenly, his right hand spasmed. The accumulated nitroglycerin-like sweat coating his palm reached a critical mass, catalyzed by a sudden, involuntary spark from his pores.

A blinding flash of white-hot light eradicated the afternoon sun. 

The sound was deafening—a concussive, roaring BOOM that shattered the ambient noise of the playground and sent a flock of pigeons scattering into the sky in sheer panic. A thick cloud of black and gray smoke instantly engulfed Izuku and Katsuki. 

For a split second, time seemed to stop. The other children froze, their smiles instantly melting into masks of horror. 

Then, the screaming started. 

"Ahhhhh!" one of the boys shrieked, stumbling backward and falling onto the rubber matting. 

Katsuki stumbled out of the smoke cloud, his eyes wide with an alien, paralyzing terror. He looked down at his right hand, which was trembling violently. He hadn't held back. He hadn't controlled it. That was a full-power, unrestrained, point-blank explosion, right in Izuku’s face. 

I killed him, Katsuki’s four-year-old brain concluded with icy, horrifying clarity. I blew Deku’s head off.

"Deku!" Katsuki screamed, his voice cracking, panic stripping away all his bravado. "Deku!!"

A nearby mother, who had been sitting on a bench reading a magazine, dropped her bag and sprinted toward the sandbox, her face pale with dread. "Oh my god! Izuku! Somebody call an ambulance!"

The smoke began to clear, drifting lazily upward in the still, humid air. The smell of explosives was choking, burning the back of the throat. Katsuki fell to his knees, tears instantly welling in his eyes as he stared at the epicenter of the blast, terrified of the gruesome sight he was about to behold.

As the gray veil parted, a small silhouette became visible. 

Izuku Midoriya was still standing there. 

He hadn't been blown backward. He hadn't fallen over. His posture was exactly the same as it had been a moment prior—leaning slightly forward, hands resting on his knees. 

The mother sprinted over, dropping to the dirt and frantically grabbing Izuku's shoulders, turning him around to inspect his face. "Izuku! Sweetheart, are you—"

Her voice caught in her throat. Katsuki, still on his knees, blinked the tears away, his jaw dropping in absolute disbelief. 

Izuku’s face was perfectly fine. 

His skin was not burned. His eyebrows were not singed. His corneas were perfectly clear. Even the fine, peach-fuzz hair on his cheeks was completely untouched. He wasn't bleeding, he wasn't crying, and he wasn't screaming. 

In fact, Izuku just looked profoundly confused. 

"Why is everyone screaming?" Izuku asked, his high, soft voice cutting through the ringing silence of the playground. He looked at the terrified mother, then over at Katsuki, who was hyperventilating in the dirt. "Kacchan, why are you crying? Did you hurt your hand?"

Katsuki couldn't speak. He just pointed a trembling finger at Izuku's face. 

Izuku reached up and wiped his cheek. His hand came away covered in a layer of fine, black soot. The explosion had left a perfect, cartoonish ring of ash around his face, staining his skin black. But beneath the soot, the skin was cool to the touch and completely undamaged. 

"Izuku..." the mother gasped, frantically patting his chest, checking his ears for bleeding. "You... you took that blast right in the face! Are you deaf? Can you hear me?!"

"I can hear you perfectly fine, Miss Haruka," Izuku replied, blinking innocently. "It was bright, but it didn't hurt."

He looked back at Katsuki. "Kacchan, that was a big one! But why didn't it push me back?"

Katsuki stared at his childhood friend as if looking at a ghost. The fear that had gripped his heart suddenly morphed into an intense, confusing frustration. He had unleashed his ultimate power, a blast that could crack concrete, directly into the softest, weakest kid he knew. And the kid hadn't even blinked. 

He hadn't even flinched. 

The sterile smell of rubbing alcohol and bleached linoleum filled the examination room. Inko Midoriya sat on the edge of the vinyl-covered chair, her hands wringing a crumpled tissue so tightly her knuckles were white. Her eyes were red-rimmed from crying. 

Izuku sat on the examination table, swinging his short legs back and forth, humming the theme song to the animated All Might cartoon. His face had been thoroughly scrubbed by the nurses, removing the soot, leaving his freckles on full display. He seemed entirely unbothered by the fact that he was currently in a specialized Quirk Assessment Clinic.

Dr. Tsubasa, a bald man with a bushy mustache and unusual, round goggles perched on his forehead, was staring intently at a clipboard. He flipped a page, adjusted his glasses, and let out a long, heavy sigh.

"Well, Mrs. Midoriya," Dr. Tsubasa began, his voice dry and clinical. "The good news is, your son is perfectly healthy. No hearing damage, no retinal scarring, no concussive brain trauma. Physically, he is a remarkably average four-year-old."

Inko let out a shuddering breath of relief. "Oh, thank goodness. When Mitsuki called me and said Katsuki had an accident with his quirk... I thought... I thought my baby was gone."

"A perfectly reasonable fear," Dr. Tsubasa said, leaning back in his rolling chair. "Young Bakugo's quirk is exceptionally potent for a child his age. A blast of that magnitude at point-blank range should have, by all medical logic, resulted in third-degree burns, ruptured eardrums, and severe facial lacerations, if not fatal kinetic trauma."

Inko stiffened, the fear returning. "But... he didn't even have a red mark. How is that possible?"

Izuku stopped humming and looked at the doctor, his eyes bright. "Is it my quirk, Doctor? Do I have a super-strong quirk?!"

Dr. Tsubasa offered a tight, patronizing smile. He reached out and tapped Izuku’s knee with a small reflex hammer. Izuku’s leg kicked out. 

"You do have a quirk, Izuku," the doctor said. "Though 'super-strong' might be... an overstatement."

Inko leaned forward. "What is it? My husband can breathe fire, and I have a minor telekinetic pull. Did he inherit a combination?"

"Neither, actually," Dr. Tsubasa said, pulling up an x-ray on the light board behind him. It showed a scan of Izuku’s skeleton, alongside complex readouts of his cellular structure. "Quirks are genetic, yes, but they can also spontaneously mutate into entirely new classifications. In Izuku’s case, he has developed a highly specific, highly specialized Mutant-Emitter hybrid quirk."

"What does it do?" Izuku asked, practically vibrating on the paper-covered table. 

"Put simply, Izuku, you are completely, physically immune to explosions."

Silence hung in the clinic room. The air conditioner hummed softly in the background. 

Inko blinked. "Immune... to explosions? That's it?"

"It is a fascinating anomaly," Dr. Tsubasa continued, tapping the x-ray. "We ran a series of micro-tests in the secure chamber down the hall while he was sedated for the MRI. We exposed a small patch of his skin to controlled, low-yield C4 detonations, thermal flares, and pressurized shockwaves."

Inko gasped, clapping a hand over her mouth. "You blew up my son?!"

"Micro-detonations, Mrs. Midoriya. Completely safe, standard protocol for determining resistance quirks," Dr. Tsubasa reassured her quickly. "The results were astounding. Izuku's quirk operates on a passive, subconscious level. When his body is exposed to an explosive reaction—meaning a rapid, exothermic expansion of gases and energy—his cellular structure instantaneously hardens and absorbs the kinetic, thermal, and acoustic energy without taking any damage."

Izuku’s eyes widened. "Like an invincible shield?!"

"Well... no," Dr. Tsubasa corrected gently. "And this is where we must be realistic. You see, the immunity is incredibly specific. It only applies to explosions."

The doctor picked up a small, wooden tongue depressor from a jar on his desk. He walked over to Izuku and, without warning, lightly thumped the boy on the forehead with it. 

"Ow!" Izuku yelped, rubbing his forehead. It wasn't a hard hit, but it stung. 

"See?" Dr. Tsubasa said, looking at Inko. "If a villain throws a punch at him, he will bruise. If he falls out of a tree, he will break his arm. If someone cuts him with a knife, he will bleed. His body does not recognize blunt force, piercing trauma, or gradual thermal heat as an 'explosion.' If he stood in a burning building, the smoke and ambient fire would kill him just like anyone else. But if a bomb went off right next to his head? He wouldn't feel a thing."

Inko stared at the doctor, trying to process the incredibly niche nature of her son's power. "So... he's only protected if something explodes?"

"Exactly. And only from the explosion itself. If a bomb goes off and throws a piece of shrapnel—like a piece of glass or a rock—and that rock hits him, his body will register the rock as blunt-force trauma, and he will be injured. He is immune to the blast wave, the heat flash, and the sound of the detonation. Nothing else."

Dr. Tsubasa sighed, sitting back down. "In a practical sense, Mrs. Midoriya... it is an almost entirely useless quirk for daily life. Unless he plans on working in a bomb disposal unit or a very specific demolition environment, his quirk will likely never activate. For all intents and purposes regarding his daily safety, you should treat him as if he were quirkless."

The word hung in the air, heavy and suffocating. Quirkless. Or, at least, adjacent to it. 

Izuku felt the bright, soaring balloon in his chest suddenly pop. The All Might figure in his lap felt heavy, mocking. "But... Doctor..." Izuku's voice trembled, his lower lip quivering. "Can I... can I still be a hero? Like All Might?"

Dr. Tsubasa looked at the boy with a mixture of pity and exhaustion. He had crushed thousands of dreams in this very room. It was the hardest part of the job. 

"Heroes need to fight villains, Izuku," the doctor said softly. "Villains use swords, and super strength, and water, and lasers. Your quirk won't stop any of those. And you have no offensive power to fight back. You can't shoot explosions, you can only survive them. It’s a purely passive defense against a threat that almost never happens. I’m sorry, son. But hero work... it's just not in the cards for you."

Tears, big and hot, finally spilled over Izuku’s lower lashes, tracking down his freckled cheeks. He gripped the All Might figure so tightly his small fingers ached. 

Later that night, the Midoriya apartment was dark and quiet. Izuku sat at the family computer, the glow of the monitor casting long, shifting shadows across his tear-stained face. On the screen, a video played on a loop. It was an old clip—a disaster in the city, fires raging, buildings crumbling. And emerging from the wreckage, carrying a dozen people on his back with a booming laugh, was All Might. 

“It’s fine now! Why? Because I am here!”

Inko stood in the doorway, her heart breaking into a million pieces. She watched her small, fragile son point a trembling finger at the screen. 

"Mom..." Izuku whispered, his voice thick with unshed tears. "Even if I can't fight... even if my quirk is useless... can I still be like him?"

Inko rushed forward, falling to her knees and wrapping her arms around Izuku, pulling him into a desperate, sobbing embrace. "I'm sorry, Izuku! I'm so sorry! I wish things were different!"

She cried for him. She apologized because she believed the doctor. She believed society. She believed that a quirk that only functioned as a highly specific shield was a curse of false hope. 

But as Izuku buried his face in his mother's shoulder, his eyes remained fixed on the glowing screen. He didn't want apologies. He wanted someone to tell him yes. 

And deep down, a tiny, stubborn ember of defiance refused to be extinguished. His quirk wasn't flashy. It couldn't hurt anyone. But he remembered the look on Kacchan’s face today. The absolute awe, the shock. 

For a split second, Kacchan had thrown everything he had at him, and Izuku hadn't moved an inch. 

I didn't flinch, Izuku thought to himself, the realization settling into his bones. I survived.

Growing up with the Blast-Proof quirk, as Izuku later named it in his hero analysis notebooks, was a bizarre, isolating experience. 

In a world where 80% of the population possessed a superpower, society had developed an unspoken hierarchy based on utility and flashiness. Emitter quirks that could produce fire, ice, or electricity were revered. Mutant quirks that granted enhanced strength or flight were highly sought after. 

Defensive quirks were generally respected, provided they were versatile. Kirishima Eijiro, a boy a few towns over, could harden his entire body into impenetrable rock, rendering him immune to punches, blades, and falling debris. That was a useful defensive quirk.

Izuku’s quirk was a cosmic joke. 

In elementary school, when the teachers asked the children to demonstrate their quirks for a class project, Izuku had nothing to show. 

"My quirk makes me immune to explosions," Izuku had announced proudly to the class, standing at the front of the room.

The class had stared in silence. 

"Can you show us?" the teacher asked politely.

Izuku shifted uncomfortably. "Um. No. I need someone to blow me up first."

The class erupted into laughter. 

"What a lame quirk!" a kid with elongated, stretchy fingers mocked. "So basically, you don't have a quirk unless someone throws a grenade at you?"

"My dad says peace times are here to stay," a girl with small horns added. "There aren't any bombs going off in the city. So your quirk is totally useless, Midoriya!"

Useless. The word stuck to him like tar. It was the same verdict the doctor had given, now echoed by his peers. Because his quirk was entirely invisible and reliant on a highly specific, dangerous external trigger, the children simply treated him as if he were quirkless. 

He was frail. He was easily bruised. He cried when he scraped his knee. He was, in every measurable metric, weak. 

Except in the eyes of one person. 

Katsuki Bakugo’s relationship with Izuku twisted into something complex, toxic, and deeply confusing. 

Katsuki’s ego grew in tandem with his explosions. By the time they reached third grade, Katsuki was the undisputed king of their elementary school. His explosions were large enough to dent metal and shatter glass. He was praised by every adult, feared by every child. He possessed the ultimate offensive power. 

But Izuku Midoriya was a living, breathing paradox that Katsuki’s pride simply could not reconcile. 

Izuku was weak. Izuku was a crybaby. Izuku couldn't throw a punch to save his life. Yet, Katsuki knew a secret that gnawed at him every single day. 

My quirk doesn't work on him.

It was an infuriating reality. Katsuki's entire worldview was built on the foundation that his explosions could dominate anything and anyone. But Izuku was the exception. Izuku was the void where his power vanished.

This created a bizarre dynamic. Katsuki began to bully Izuku, leading the other children in mocking him, giving him the derogatory nickname "Deku"—meaning one who can't achieve anything. He pushed Izuku around, tripped him in the hallways, and belittled his dreams of going to U.A. High. 

But Katsuki never used his quirk on Izuku. Not after that day at the playground. 

The other kids assumed Katsuki was just showing restraint, that he didn't want to seriously injure the weak, "quirkless" boy. But Katsuki knew the truth. If he used his quirk on Izuku, the illusion of Katsuki’s absolute superiority would shatter. 

If Katsuki blasted a desk, the desk exploded into splinters. If Katsuki blasted a villain, the villain would burn. But if Katsuki blasted Izuku, Izuku would just stand there, unharmed, staring at him with those massive, emerald eyes. It was a psychological block that Katsuki couldn't overcome. Izuku's very existence made Katsuki feel weak.

This tension boiled over during their first year at Aldera Junior High.

Izuku was thirteen years old, still short, still scrawny, and still obsessively scribbling in his Hero Analysis for the Future notebooks. He had just finished compiling a detailed breakdown of the new pro-hero, Kamui Woods, when a shadow fell over his desk. 

Izuku looked up. Katsuki was standing there, flanked by two of his lackeys. Katsuki had grown taller, his muscles already defined from rigorous martial arts training—training he had specifically undertaken to ensure he could fight without relying solely on his quirk. 

"What're you writing, Deku?" Katsuki sneered, his red eyes narrowing as he looked down at the notebook. 

"N-nothing, Kacchan," Izuku stammered, instinctively pulling the notebook toward his chest. "Just... hero notes."

"Hero notes?" One of the lackeys, a boy with a long, reptilian neck, laughed. "Are you still dreaming about getting into U.A.? You're practically quirkless, Midoriya. What are you gonna do if a villain attacks? Hope he has a stick of dynamite so you don't get hurt?"

The other lackey snickered. 

Katsuki didn't laugh. His jaw tightened. The mention of Izuku’s quirk always irritated him. He slammed his hand down onto Izuku's desk, leaning in close. 

"Listen to me, you damn nerd," Katsuki growled, small pops of warning explosions crackling across his palm, slightly charring the wood of the desk. "You're not going to U.A. I'm going to be the only one from this crappy middle school to make it into the hero course. I'm not going to have some useless, stepping-stone pebble like you ruining my origin story."

Izuku shrank back slightly from the heat of the desk, but his eyes never left Katsuki’s. He didn't look away. He never did. 

"I... I can still try, Kacchan," Izuku said softly, his voice trembling but refusing to break. "There's no rule against someone with a defensive quirk applying. I've been studying..."

"Studying doesn't mean crap in a real fight!" Katsuki snapped. His temper flared, his pride stinging at Izuku's persistent defiance. Katsuki's right hand instinctively raised, his palm facing Izuku's chest. The air around his hand rippled with heat, the sweet smell of nitroglycerin filling the classroom. 

The two lackeys took a step back, grinning maliciously, expecting Katsuki to blast the boy into the wall. 

"Teach him a lesson, Bakugo!" one of them cheered. 

Katsuki stared at Izuku. His palm was inches from Izuku's uniform shirt. A single flex of his will, and a massive explosion would erupt. 

Izuku didn't raise his arms to protect himself. He didn't squeeze his eyes shut. He simply sat there, staring up at Katsuki with an expression of quiet, infuriating calm. 

He knows, Katsuki thought, his teeth grinding together so hard his jaw ached. He knows it won't do a damn thing.

Katsuki’s hand trembled. The sweat on his palm sparked violently, ready to ignite. But he couldn't do it. If he fired the blast, the smoke would clear, and Izuku would still be sitting there, unbothered, while the desk and the windows shattered around him. The lackeys would see that Katsuki's ultimate power was useless against the school's biggest loser. It would be an utter humiliation. 

With a roar of frustration, Katsuki violently redirected his hand. 

KABOOM!

Instead of blasting Izuku, Katsuki slammed his exploding palm into the empty desk next to Izuku’s. The force of the blast shattered the wooden surface into a thousand flaming splinters, sending a shockwave through the classroom that rattled the windows and knocked the lackeys off their feet. 

Smoke filled the air, thick and choking. The fire alarm down the hall began to blare. 

Through the haze, Katsuki breathed heavily, his chest heaving, his eyes burning with rage. He glared through the smoke at Izuku. 

Izuku hadn't moved. The concussive shockwave that had knocked the other boys over had simply washed over Izuku like a gentle breeze. The thermal heat that had warped the metal legs of the neighboring desk hadn't even caused Izuku to break a sweat. The deafening sound hadn't made him wince. 

Izuku was physically incapable of flinching at an explosion. 

Katsuki hated him for it. He hated the way Izuku’s green eyes looked at him, not with fear, but with a deep, knowing empathy. 

"Don't you ever look at me like that," Katsuki hissed, his voice dropping to a venomous whisper, meant only for Izuku's ears. "Your quirk is a fluke. It's a glitch. If I wanted to, I could beat you to a pulp with my bare hands. You're nothing without someone else's bombs."

Katsuki turned on his heel and stormed out of the classroom, kicking a broken piece of desk out of his way. The lackeys scrambled to their feet and hurried after him, coughing from the smoke. 

Izuku remained seated in the silent, ruined classroom. He looked down at his own hands. They were soft, uncalloused, entirely unremarkable. 

Katsuki was right, of course. Izuku was useless in a fight. He had spent years trying to figure out a way to make his quirk viable for hero work. He had researched support items, martial arts, and strategic combat. But without enhanced strength or speed, his physical body was just that of a normal, fragile teenager. 

If a villain attacked with a sword, Izuku would die. If a villain attacked with a water quirk, Izuku would drown. His immunity was a hyper-specific lock waiting for a very specific key. And villains simply didn't use explosions enough to justify him being on the front lines. 

But I won't give up, Izuku thought, gripping his pen tightly. He pulled his notebook back toward himself, brushing a piece of ash off the cover. There has to be a way. A way to use this. I just have to be smart enough to find it.

He opened the notebook to a blank page at the very back. At the top, he wrote a single heading: Quirk Application: Blast-Proof.

Below it, he began to write. He detailed his immunity to kinetic shockwaves originating from exothermic reactions. He detailed his immunity to thermal expansion and acoustic trauma. 

Then, he paused. He tapped his pen against his chin, his mind working furiously. 

If his body absorbed the kinetic force of an explosion without taking damage... what happened to that energy? It didn't just disappear. Physics dictated that energy had to go somewhere. If he stood in front of a massive explosion, he wasn't pushed back because his quirk somehow anchored his mass or nullified the kinetic transfer entirely. 

But what if he wasn't standing still? What if he wanted to be moved?

Izuku scribbled a crude drawing of himself, with an explosion going off behind him. He drew an arrow pointing forward. 

Theory 1, Izuku wrote quickly, his handwriting messy with excitement. If I am in the air, without the friction of the ground anchoring me, and an explosion detonates behind me... my body won't take damage from the blast, but will the kinetic shockwave propel my mass forward? Can I use an explosion to launch myself?

He stared at the drawing. It was a dangerous, insane idea. It would require him to intentionally throw himself into the blast radius of highly lethal explosives. It would require perfect timing. If he miscalculated and hit a wall at high speed, his quirk wouldn't protect him from the blunt force trauma of the impact. He would be crushed. 

But it was a start. It was an offensive application of a defensive quirk. 

He didn't need to generate his own power. He just needed to find a way to weaponize the power of others. He needed to become a master of redirecting destructive force. 

Izuku closed the notebook and shoved it into his yellow backpack. He stood up, coughing slightly as the residual smoke in the room finally reached his lungs. He walked over to the shattered remains of the desk Katsuki had destroyed. 

He bent down and picked up a piece of charred wood. It was still warm to the touch. 

Katsuki Bakugo was determined to be the greatest hero in the world, relying on absolute, overwhelming, explosive power. He was a force of nature, a hurricane of fire and noise. He believed that everything in the world could be destroyed if he just hit it hard enough. 

But Izuku Midoriya knew a secret that the rest of the world didn't. 

You can't break me, Kacchan, Izuku thought, his emerald eyes hardening with a quiet, unyielding resolve. You can blow up the whole world, but I'll still be standing right here.

Izuku tossed the piece of burnt wood into the trash can and walked out of the classroom, stepping out into the bright afternoon sunlight. The road to U.A. High School was going to be long, brutal, and dangerous. He was essentially a quirkless boy trying to climb a mountain of gods. 

But Izuku had one advantage that no one else had. 

When the bombs started falling, and the world was consumed by fire and noise, and everyone else was forced to duck and cover...

Izuku Midoriya would be the only one walking straight through the flames. 

Because he was the boy who didn't flinch. And he was going to save them all.

The underpass was cool, damp, and smelled faintly of mildew and old exhaust fumes. Izuku Midoriya walked with his head down, his yellow backpack slung over both shoulders, his mind miles away. 

His notebook, the one with the freshly burned cover, was safely tucked inside. He had spent the entire afternoon class staring blankly at the blackboard, turning over the mechanics of his quirk in his head. Blast-Proof. It was a good name. Clinical. Accurate. But accuracy didn’t change the fundamental reality of his existence: he was a boy holding a shield in a world where everyone else was swinging swords.

Izuku sighed, his breath echoing softly off the curved concrete walls of the tunnel. His encounter with Katsuki earlier that day still stung. Not the explosion—that was physically impossible for him to feel—but the words. You’re nothing without someone else’s bombs.

"He's right," Izuku muttered to the empty tunnel, kicking a loose pebble. "Unless a villain decides to attack me with a rocket launcher, I'm just a normal kid. I don't have super speed. I don't have super strength. I'm just... durable against one very specific thing."

A strange, wet squelching sound interrupted his thoughts. 

Izuku stopped walking. The sound echoed again, louder this time, like thick mud being stirred in a massive vat. He turned around, his emerald eyes scanning the dim expanse of the underpass. 

From a manhole cover a few yards away, a thick, putrid, dark-green substance was bubbling upward. It didn't flow like water; it moved with malicious intent, rising into a towering, gelatinous mass. Two massive, bulbous eyes rolled to the surface of the muck, followed by a jagged, shifting maw of what looked like broken teeth.

"A medium-sized invisibility cloak..." a voice gurgled from the sludge, vibrating with a wet, gravelly pitch. "Perfect. You’ll do nicely, kid."

Izuku froze. His heart slammed against his ribs, initiating a panicked rhythm. A villain. A real, actual villain, right here, right now. His mind raced, automatically trying to categorize the threat. Mutant type? Or Emitter with body-altering properties? Fluid-based. High mobility in tight spaces.

"Don't worry," the Sludge Villain hissed, lunging forward with terrifying speed. "It'll only hurt for about forty-five seconds. Then, it'll all be over."

Before Izuku could even take a step back, the sludge crashed into him like a tidal wave of wet cement.

The impact knocked the breath out of him, but it was what came next that brought true, primal terror. The sludge forced its way into his nose, down his throat, choking off his airway instantly. It tasted like sewage and rotting garbage. Izuku's hands flew to his neck, his fingers clawing desperately at the viscous fluid, but there was nothing to grip. His nails just slid through the mud, scraping uselessly against his own skin.

I can't breathe! Izuku’s mind shrieked. 

Panic consumed him. He thrashed, his legs kicking wildly, but the villain’s mass was too heavy, too encompassing. 

This was the brutal, unvarnished truth of his existence. If this villain had shot a fireball at him, Izuku would have burned. If the villain had swung a sword, Izuku would have bled. But drowning? Suffocation? Asphyxiation? His body had absolutely no defense against this. His Blast-Proof quirk remained completely dormant. There was no rapid exothermic expansion of gases, no concussive shockwave. Just the slow, agonizing, physical pressure of fluid filling his lungs. 

I'm dying, Izuku realized, his vision beginning to edge with black. My quirk is completely useless. I'm going to die in a tunnel.

Tears leaked from the corners of his eyes, mingling with the filthy sludge. He thought of his mother. He thought of the unwritten pages in his notebook. He thought of Katsuki, who would probably just scoff at the news of his death. 

"Stop fighting it, kid!" the villain growled, the vibration rumbling directly against Izuku’s chest. "I'm in a hurry! He's right behind me!"

Suddenly, the manhole cover rattled again. But this time, it didn't just slide aside—it was blown clean off its hinges, ricocheting off the tunnel ceiling with a deafening CLANG.

A massive figure stepped out of the shadows. The silhouette was unmistakable. Two prominent tufts of blonde hair stood up like the letter 'V'. Muscles that looked as though they were carved from granite strained against a simple white t-shirt. 

"Fear not, young man!" a voice boomed, carrying a resonance that seemed to vibrate the very air in the tunnel. "I am here!"

Izuku’s fading consciousness flared with sudden, blinding disbelief. All Might?!

"Texas..." All Might pulled back his right arm. The air around his fist seemed to warp and distort from pure, terrifying pressure. "...SMASH!"

The hero didn't punch the villain. He punched the air. But the resulting wind pressure was a hurricane compressed into a five-foot radius. The sheer kinetic force tore through the tunnel. 

It hit the Sludge Villain like a freight train. Because the attack was pure, blunt-force wind pressure and not an explosive chemical reaction, Izuku’s quirk didn't activate. The wind hit him just as hard as it hit the villain. But it did exactly what was needed: it ripped the sludge away from his body, tearing the fluid into thousands of harmless droplets that splattered against the concrete walls.

Izuku was thrown backward by the gale, hitting the cold ground hard. The blunt impact rattled his teeth and bruised his spine. He gasped, greedily sucking in mouthfuls of foul-tasting air, coughing violently as the world spun. 

Through his blurry vision, he saw the Number One Hero quickly gathering the unconscious, scattered pieces of the Sludge Villain and stuffing them into two empty soda bottles. 

Then, everything went black.

"Hey! Hey! Wake up!"

Izuku’s eyes snapped open. The bright afternoon sun assaulted his corneas. He was lying on the grass just outside the tunnel. Looming over him, casting a massive, heroic shadow, was All Might. The hero was gently tapping Izuku’s cheek with a hand the size of a dinner plate.

"Ah! Good! You're awake!" All Might boomed, flashing his trademark, dazzling smile. "Apologies for the rough treatment back there, but I had to act fast! I've captured the villain, and it's all thanks to you!"

Izuku scrambled backward, his heart leaping into his throat. He was sitting in front of his idol. The man he had watched on the computer screen a thousand times. It was surreal. It was impossible. 

"All Might!" Izuku squeaked, his voice cracking. "Oh my goodness! I—I need an autograph! Where is my notebook?!"

He frantically unzipped his backpack, pulling out his charred notebook. He opened it, only to find that All Might had already signed it in massive, sprawling letters that took up two whole pages. 

"Thank you so much!" Izuku bowed so low his forehead brushed the grass. "This will be a family heirloom! I'll pass it down for generations!"

"Well, I must be off!" All Might said, turning away and patting the pockets of his cargo pants, where the soda bottles containing the villain were securely stowed. "Pro heroes are constantly fighting time as well as enemies!"

Wait, Izuku thought, panic seizing him. He can't leave yet. I have to ask him.

This was his chance. The only chance he would ever get in his entire life to ask the one question that had haunted him since he was four years old. He needed the Number One Hero to tell him the truth.

As All Might bent his knees, preparing for a massive jump, Izuku lunged forward. He didn't think. He just acted. He threw his arms around All Might’s massive calf.

"Thanks for your continued support!" All Might shouted, completely oblivious to the extra weight, and launched himself into the sky.

The wind roared in Izuku’s ears. The ground fell away instantly, the city of Musutafu shrinking into a patchwork quilt of rooftops and streets. 

"Hey! What are you doing?!" All Might yelled, looking down in shock as he soared through the air. "Let go! Are you crazy?!"

"If I let go now, I'll die!" Izuku screamed over the rushing wind, his eyes squeezed shut, his face flapping in the extreme velocity. "My quirk only stops explosions! It doesn't stop gravity!"

All Might sighed, realizing the boy was right. He adjusted his trajectory, aiming for a tall, nondescript office building. With a heavy thud that cracked the concrete tiles, they landed on the desolate rooftop.

Izuku collapsed onto his hands and knees, hyperventilating, his heart hammering against his ribs like a trapped bird. 

"That was incredibly reckless, young man," All Might scolded, wiping a bit of blood from the corner of his mouth—a detail Izuku, in his panic, failed to notice. "You could have been killed. Now, knock on the door down there. I'm sure the building manager will let you out. I have to go."

"Wait!" Izuku cried out, scrambling to his feet. "Just one second! I have to know!"

All Might stopped, but he didn't turn around. Steam was beginning to rise from his massive frame, a strange, hissing vapor that curled into the summer air. 

"Can someone with a quirk like mine become a hero?!" Izuku shouted, the words tearing from his throat. The raw, desperate emotion in his voice echoed across the empty rooftop. "My quirk... it’s called Blast-Proof. I am completely immune to explosions. Fire, shockwaves, the noise—none of it hurts me if it comes from an explosion."

All Might looked over his shoulder, his interest mildly piqued. "Immune to explosions? That is a very specific resistance."

"But that's all it is!" Izuku continued, his fists clenching at his sides. "I don't have super strength. I can't shoot lasers. If a villain punches me, I get hurt. If a villain uses a sword, I get cut. The doctor told me it was useless. Kacchan tells me I'm useless. But I want to save people! I want to be fearless, like you! So please, tell me... can someone who can only take a hit from a bomb, but can't throw a punch... can I still be a top hero?"

Silence fell over the roof, broken only by the whistling wind and the hissing steam radiating from All Might's body. 

Then, the hero sighed. It was a heavy, weary sound. "Pro heroes are always risking their lives, young man."

Suddenly, a thick cloud of white smoke erupted around All Might. Izuku coughed, waving the vapor away. When the air cleared, Izuku gasped in horror. 

The towering symbol of peace was gone. In his place stood a skeletal, emaciated man with sunken, shadowed eyes, wearing clothes that hung off his frail frame like a scarecrow. 

"W-what?!" Izuku shrieked, looking around frantically. "Where did All Might go?! Are you a fake? An imposter?!"

"I am All Might," the skeletal man said, blood spilling from his mouth as he spoke. He slumped against the rooftop railing, pulling up his oversized shirt to reveal a horrifying, jagged mass of purple and red scar tissue covering the entire left side of his chest. 

Izuku covered his mouth, feeling sick. 

"I got this from a villain attack five years ago," All Might explained, his voice raspy and weak. "Half my respiratory organs were destroyed. I lost my entire stomach. I can only do hero work for about three hours a day now."

"Five years ago?" Izuku muttered, his encyclopedic mind racing. "Was that the fight with Toxic Chainsaw?"

"You know your stuff. But no, that punk couldn't bring me down," All Might said, staring out over the city skyline. "I kept this fight hidden from the public. The Symbol of Peace cannot be seen as vulnerable. I have to be a pillar of strength, to keep the villains at bay."

All Might turned his hollow, piercing eyes toward Izuku. The look in his eyes was not unkind, but it was brutally honest.

"You asked me if you could be a hero with your quirk," All Might said softly. "You have a shield, young man. A very strong shield against a very rare weapon. But the world of pro heroism is chaotic. Villains don't play by the rules. They use knives, guns, poison, water, psychic attacks. If you are standing on the front lines, and your quirk only protects you from one percent of the threats out there... you will die."

Izuku felt the breath leave his lungs as if he had been punched. The words hit him harder than the Sludge Villain's attack. 

"I cannot, in good conscience, tell you that you can be a hero on the front lines," All Might continued, his voice heavy with regret. "Not without offensive power, or a more versatile defense. It's too dangerous. If you want to help people with your quirk, become a police officer. Join a bomb disposal unit. They get mocked, but it's fine, honorable work."

All Might pushed himself off the railing, walking toward the rooftop access door. "It's not bad to dream, young man. But you have to make sure your dreams are realistic."

The heavy metal door clicked shut. Izuku was alone.

The world seemed to lose its color. The vibrant, bustling city below looked gray and muted. The Number One Hero, the man Izuku had worshipped his entire life, had just confirmed everything everyone else had ever said. 

Realistic.

Izuku fell to his knees on the hard concrete. He didn't cry. He was too empty to cry. The balloon of hope that he had carried in his chest for ten years had finally, permanently popped. 

It took Izuku a long time to walk down the stairs of the building. His legs felt like lead. His mind was blank, devoid of the constant, analytical hum that usually occupied his thoughts. 

He was walking aimlessly down the streets of the Tatooin Shopping District, not really paying attention to where he was going. He just wanted to go home, crawl into bed, and maybe throw away his notebooks. 

Suddenly, a sound broke through his depression. 

BOOM!

It was a deep, concussive thud that rattled the windows of the nearby storefronts. Izuku stopped. That wasn't a normal sound. It sounded like an explosion. 

BOOM! KABOOM!

Two more blasts, louder this time. A thick plume of black smoke began to rise over the rooftops a few blocks away. 

Izuku's legs started moving before his brain gave the order. It was instinct. It was the deeply ingrained habit of a boy who lived for hero analysis. He ran toward the smoke, navigating through the panicked crowds fleeing in the opposite direction. 

He turned the corner onto the main thoroughfare and stopped dead in his tracks. 

The scene was absolute chaos. A massive fire had engulfed half the street. Storefronts were shattered, telephone poles were snapped in half, and the air was thick with the suffocating smell of burning rubber and caramelized nitroglycerin. 

A large crowd had gathered behind a police barricade, watching in terror. Izuku pushed his way to the front, his eyes wide. 

Standing in the center of the destruction, completely surrounded by a towering inferno, was the Sludge Villain. 

Izuku gasped, his hand flying to his mouth. The bottles! They must have fallen out of All Might's pocket when I grabbed his leg! This... this is my fault!

But that wasn't the worst part. The Sludge Villain had captured someone else. And whoever it was, they were fighting back with everything they had. 

BANG! BOOM! CRACK!

Massive, blinding flashes of golden-orange light erupted from inside the sludge. The explosions were titanic, tearing chunks of the villain away, but the fluid just rapidly reformed, trapping the victim further. The blasts were so violent, so continuous, that they were creating a literal wall of kinetic force and fire, pushing the flames outward in a localized firestorm. 

"Why aren't the heroes doing anything?!" a man in the crowd yelled. 

Izuku looked around. The pro heroes were there. Death Arms, Kamui Woods, Mt. Lady, and Backdraft were all standing just beyond the perimeter of the fire, looking deeply frustrated. 

"It's no good!" Death Arms shouted, shielding his face from the intense heat. "The kid the villain captured is using a powerful explosion quirk! He's panicking! Every time I try to run in, the concussive force of his blasts knocks me back! I can't get close enough!"

"My wood will catch fire instantly in that inferno!" Kamui Woods gritted his teeth. 

"I need at least two lanes of clearance to grow, I can't get in there!" Mt. Lady groaned.

"I have my hands full just keeping the fires from spreading to the civilian crowd!" Backdraft yelled over the roar of the flames, his water hoses spraying down the adjacent buildings. "We have to wait for someone with a suitable quirk!"

Izuku stared in horror. An explosion quirk.

He looked closer, squinting through the heat distortion and the thick black smoke. The Sludge Villain shifted, and for a split second, the victim's face was visible. 

Ash-blonde hair. Red eyes, wide with sheer, unadulterated terror. 

It was Katsuki. 

Izuku's breath hitched. Katsuki Bakugo, the boy who claimed he would be the number one hero, the boy who possessed the ultimate power, was suffocating. His explosions, the very thing he prided himself on, were currently his worst enemy. They were keeping his rescuers at bay, trapping him in a prison of his own making. 

"He's running out of air," Death Arms muttered angrily. "If he doesn't stop setting off blasts, he's going to suffocate before we can get to him!"

But Katsuki couldn't stop. He was suffocating, blinded by sludge and panic, acting on pure survival instinct. He was firing off point-blank, maximum-yield Howitzer-level blasts, turning the intersection into a literal bomb crater. 

Izuku watched Katsuki’s eyes. He saw the desperation. He saw the realization dawning in Katsuki’s gaze that his power wasn't going to save him this time. Katsuki was going to die.

It's my fault, Izuku thought, his hands trembling. If I hadn't grabbed All Might, the villain wouldn't be here. Kacchan is going to die because of me.

Izuku looked at the pro heroes. They were waiting. They were making the rational, realistic choice. Getting close to those explosions meant severe burns, ruptured eardrums, or being killed by the concussive shockwaves. They didn't have the right quirks to survive walking into a live minefield. 

You have a shield against a very rare weapon, All Might's voice echoed in Izuku’s mind. 

The concussive force knocks me back, Death Arms had said. 

He's using a powerful explosion quirk, the crowd whispered. 

Izuku Midoriya possessed a highly specific, largely useless quirk. A quirk that offered no offensive power. A quirk that couldn't stop a punch, a sword, or a sludge whip. A quirk that society had deemed worthless. 

But right here. Right now. In this exact, terrifyingly specific situation? 

Izuku Midoriya was the only person on the planet who could walk into that inferno. 

Before his brain could process the danger, before the fear could paralyze his limbs, Izuku’s yellow backpack hit the pavement. 

He vaulted over the police barricade. 

"Hey! Kid, stop!" Death Arms roared, reaching out to grab him, but his fingers only brushed the back of Izuku’s school uniform. "Are you insane?! You'll be blown to pieces!"

Izuku didn't stop. He sprinted directly toward the raging wall of fire and concussive energy. 

BOOM!

Katsuki unleashed another massive explosion, the largest one yet. A shockwave of superheated air and kinetic force ripped through the street, shattering the remaining glass in the storefronts and forcing the pro heroes to cross their arms and brace themselves against the violent gust. 

Izuku hit the invisible wall of the shockwave. 

Instantly, his quirk activated. 

It was a sensation Izuku had only felt a handful of times in his life, and never on this scale. It wasn't a conscious effort; it was an autonomic biological response. The moment the rapid, exothermic expansion of gases struck his skin, his cellular structure hardened, aligning into a state of absolute kinetic nullification. 

To the pro heroes watching, it looked like a miracle. 

The shockwave that should have pulverized a grown man’s ribs hit the skinny teenager and simply... vanished around him. The air visibly rippled and parted, flowing past Izuku like water around a stone. 

The heat of the localized firestorm, fueled entirely by the chemical explosions, washed over him. But to Izuku, the air felt perfectly room temperature. His uniform fluttered wildly in the wind, but the fabric didn't scorch. 

The deafening, ear-shattering roar of the blast—a sound so loud it was causing the civilians a block away to cover their ears—was instantly muted in Izuku's head. His eardrums stiffened, refusing to vibrate to the acoustic trauma of the blast. 

He didn't flinch. He didn't slow down. He just kept walking.

"What the hell?!" Death Arms gasped, lowering his arms in utter disbelief. "The blast wave... it didn't even push him back!"

Inside the inferno, Katsuki’s vision was blurring. His lungs burned. He fired off another explosion, his right arm screaming in pain from overuse. 

Through the thick, swirling smoke and the blinding flashes of his own fire, Katsuki saw a silhouette approaching. 

He blinked, thinking his dying brain was hallucinating. Someone was walking through the fire. Walking straight through the epicenter of his point-blank blasts. 

The smoke parted, and emerald green eyes met blood red. 

Deku? Katsuki’s mind short-circuited. What the hell is he doing here? Why isn't he dead?!

Izuku stepped right into the heart of the blast zone. He was now less than two feet away from the Sludge Villain. Katsuki was still uncontrollably firing off smaller pops from his palms, the blasts detonating mere inches from Izuku’s face. Izuku didn't even blink. The flashes of light reflected in his wide, determined eyes. 

"What is this kid?!" the Sludge Villain gurgled in panic, trying to recoil. "Die!"

The villain whipped a thick tendril of sludge directly at Izuku’s head. 

Izuku’s eyes widened. Blunt force trauma. This will hurt.

He didn't have time to dodge. The sludge whip struck him hard across the cheek, tearing the skin and drawing blood. The physical impact threw Izuku off balance, but he gritted his teeth, planting his bright red shoes firmly onto the asphalt. 

He ignored the pain. He reached forward, plunging both of his hands directly into the churning mass of sludge covering Katsuki’s face. 

Katsuki fired another explosion from his trapped hand, the blast going off right against Izuku’s chest. The force was enough to blow a hole through a brick wall. Izuku didn't even sway. He used the total lack of concussive pushback to his advantage, anchoring his weight perfectly. 

Izuku’s fingers found the collar of Katsuki’s school uniform. He gripped it with all the meager strength he possessed. 

"Kacchan!" Izuku screamed, his voice cracking with exertion. 

He pulled. 

Because Izuku was immune to the explosive forces constantly pushing everyone else away, he acted as a perfect, immovable fulcrum. He hauled Katsuki forward, tearing the boy's face and upper torso free from the suffocating sludge. 

Katsuki took a massive, shuddering gasp of air, coughing violently. He stared at Izuku, his face entirely black with soot, save for the tracks of his tears. 

"Why... are you here?!" Katsuki choked out, his pride warring with his absolute shock. 

Izuku, his own cheek bleeding profusely from the sludge whip, offered a trembling, desperate smile. Tears pricked the corners of his eyes. 

"I don't know!" Izuku cried out honestly. "My legs moved on their own! But... Kacchan... you looked like you needed saving!"

Katsuki’s breath hitched. In that singular moment, the rigid, explosive worldview he had built over fourteen years cracked right down the middle. The weak, useless, quirkless Deku—the boy whose existence mocked Katsuki’s power—was standing in the fires of hell, bleeding, just to pull him out. 

"You little brat!" the Sludge Villain roared, recovering from the shock. The villain reared back, gathering a massive, condensed fist of sludge. "I'll crush you both!"

Izuku looked up. His quirk wouldn't save him from this. A solid, physical crush from that much mass would snap his spine. He wrapped his arms around Katsuki, turning his back to the villain, preparing to take the fatal blow. 

He closed his eyes. I did it. I used my quirk. I saved someone.

The blow never came. 

A hand, large and impossibly strong, clamped onto the villain's sludge wrist. 

Izuku opened his eyes. Standing directly above him, his blue suit torn and his massive muscles bulging with ungodly tension, was All Might. 

Blood was leaking from the corner of the hero's mouth, but his smile was radiant, fierce, and utterly terrifying. 

"I really am pathetic," All Might said, his voice dropping an octave, shaking the ground beneath their feet. "I told you the traits that make a great champion... but I didn't live up to my own ideals!"

All Might ripped his arm back, his fist clenching so tight the air around it screamed. 

"Pros are always risking their lives!" All Might roared. 

He threw the punch. 

"DETROIT... SMASH!"

The air didn't just move; it shattered. A vertical column of pure, unadulterated wind pressure erupted from All Might's fist. The sheer kinetic force instantly atomized the Sludge Villain, tearing the fluid into microscopic droplets. The wind caught the surrounding firestorm, blowing it out like a cheap candle. 

The shockwave of the punch rocketed upward, piercing the sky. Izuku, clutching Katsuki, felt the immense wind wash over them, pure physical force that had nothing to do with explosions. It pushed them down, but they were safe in the eye of the storm. 

High above Tatooin Shopping District, the dark clouds of smoke violently scattered. The immense pressure change forced the moisture in the air to rapidly condense. 

A drop of water hit Izuku’s cheek, washing away a streak of blood. 

He looked up. It was raining. 

All Might had punched the villain so hard, he changed the weather. 

The street fell dead silent, save for the patter of the sudden rain. Then, the crowd erupted into deafening cheers. 

The aftermath was a blur of flashing sirens, yellow tape, and shouting adults. 

Once the Sludge Villain was securely collected (again) and handed over to the police, the heroes turned their attention to the two middle schoolers sitting on the back of an ambulance. 

The treatment was vastly different. 

Death Arms and Kamui Woods had cornered Izuku. Kamui Woods had patched up the cut on Izuku’s cheek, but the scolding was severe. 

"There is a fine line between bravery and suicide, kid," Death Arms said, his arms crossed over his chest. "What you did was incredibly reckless. If you hadn't possessed whatever highly specific resistance quirk that was, you would be ash right now. You got in our way and put yourself in mortal danger. Leave the hero work to the pros next time."

Izuku looked down at his bright red shoes, his shoulders slumped. "Yes, sir. I'm sorry."

He knew they were right. He hadn't defeated the villain. He had just survived long enough for All Might to step in. His quirk had given him a window, but he still lacked the power to finish the fight. 

A few feet away, Katsuki was being praised by Mt. Lady and Backdraft. 

"That explosion quirk of yours is incredible!" Mt. Lady gushed. "The sheer output! When you go pro, you're going to be a powerhouse!"

"You held your own against a villain that had us stumped," Backdraft added. "You have the makings of a top-tier hero, kid."

Katsuki wasn't listening. He sat with a towel draped over his shoulders, glaring at the ground. The praise tasted like ash in his mouth. He hadn't held his own. He had panicked. He had been suffocating. And the only reason he was breathing right now was because the kid he bullied every day had walked through his ultimate power like it was a stiff breeze. 

As the heroes dispersed, Katsuki stood up and marched over to where Izuku was retrieving his charred notebook from the pavement. 

"Deku!" Katsuki shouted. 

Izuku flinched, turning around. Katsuki marched right up to him, stopping inches from his face. Katsuki’s fists were clenched, his body shaking with a volatile mixture of anger, humiliation, and an emotion he refused to identify as gratitude. 

"Listen to me, you damn nerd," Katsuki snarled, his voice tight. "I didn't ask for your help. I didn't need your help! I was fine! My explosions were wearing him down! You didn't save me, got it?! Don't you dare look down on me!"

Katsuki turned on his heel and stormed off down the street, his shoulders hunched. 

Izuku watched him go, a small, sad smile playing on his lips. Katsuki’s pride was bruised, but he was alive. That was all that mattered. 

The sun was beginning to set by the time Izuku finally started his walk home. The sky was painted in bruised hues of purple and orange. His body ached. The cut on his cheek stung. The reality of his situation settled heavily back onto his shoulders. 

He had experienced a taste of hero work today. He had used his quirk to do something impossible. But it wasn't enough. He was a shield without a sword. He couldn't fight. He couldn't win. 

"I am here!"

Izuku jumped out of his skin as All Might suddenly slid out from an alleyway, striking a dramatic pose. 

"All Might?!" Izuku gasped, stumbling backward. "What are you doing here? How did you get past the reporters?"

"Hah! I stand for justice, not soundbites!" All Might laughed, before violently coughing up blood and reverting to his skeletal, deflated form. He wiped his mouth, leaning against the brick wall of the alley. 

"Young man," All Might said, his tone turning serious. "I came here to thank you. And to apologize."

Izuku blinked, pointing to himself. "Apologize to me? But... I got in your way. The heroes scolded me."

"The heroes scolded you because they have to maintain order," All Might said, stepping closer. His hollow eyes were burning with an intense, unfamiliar light. "But I saw what happened. If you hadn't rushed into that fire... if you hadn't used your highly specialized quirk to breach that inferno... I would have been too late. The boy would have died."

Izuku looked down. "But... I couldn't beat the villain. I just grabbed Kacchan. You had to save us both."

"That is exactly the point," All Might said gently. "On that street, there were pro heroes with powerful, versatile quirks. But they hesitated. They calculated the risk and stayed back. You, a young man who was told by society—and by me—that your quirk was too situational to be useful... you were the only one who acted."

All Might placed a heavy, bony hand on Izuku’s shoulder. 

"You walked through the fire, young man. Not because you thought you could win, but because someone needed saving. That is the essence of a true hero."

Tears, hot and fast, welled up in Izuku’s eyes. He had waited his entire life to hear those words. He had been blown up, ridiculed, and told to give up. But the Symbol of Peace was looking at him with absolute respect.

"I told you on that roof that a shield against a rare weapon isn't enough," All Might continued, his voice echoing in the quiet alleyway. "And that remains true. In this world, a shield needs a sword. You have the heart of a hero, Izuku Midoriya. You have a body that can withstand the most destructive kinetic forces on the planet without flinching. But you lack the power to strike back."

All Might stood up straight, the wind catching his oversized clothes. 

"I have a proposition for you," All Might said. "My quirk... it was passed down to me like a sacred torch. It is the crystallization of power, stockpiled by generations of heroes. And I am looking for a successor."

Izuku’s jaw dropped. "Passed down...? A successor? But quirks are genetic! You can't just give someone a quirk!"

"Mine is different," All Might smiled. "It is called One For All. And I want to give it to you."

Izuku’s mind raced, trying to process the magnitude of what was being offered. The Number One Hero was offering him his power. The ultimate sword. 

"Why me?" Izuku whispered, tears spilling down his cheeks. "I'm weak. My quirk is just a weird mutation."

"Because you proved today that you are worthy of it," All Might said firmly. "Imagine it, young Midoriya. Your natural quirk makes you immune to the massive recoil and explosive force of kinetic energy. If you combined that absolute defense with the overwhelming offensive power of One For All... you wouldn't just be a hero. You would be unstoppable."

All Might held out his hand. 

"So, what do you say? Will you accept my power?"

Izuku looked at All Might’s hand. He thought of the long, dark tunnel. He thought of the firestorm, and Katsuki’s terrified eyes. He thought of his notebook, filled with dreams he had almost thrown away. 

He didn't have to be just a shield anymore. He didn't have to wait for someone else to light the fuse. 

Izuku wiped his tears with the back of his arm, a fierce, unbreakable determination settling into his emerald eyes. He reached out and grasped All Might’s hand. 

"Yes," Izuku said. "I will."

The ten months leading up to the U.A. High School Entrance Exam were a blur of rust, sweat, and the sharp, briny smell of the ocean. 

Dagobah Municipal Beach Park had long been a dumping ground for the city’s unwanted refuse. It was a sprawling graveyard of broken refrigerators, rusted cars, and warped steel. To anyone else, it was an eyesore. To Toshinori Yagi—the man the world knew as All Might—it was the perfect crucible to forge a hero.

Izuku Midoriya’s training regimen was nothing short of torture. All Might’s logic was sound: One For All was not a normal quirk. It was the physical crystallization of raw, stockpiled kinetic energy passed down through generations. If a normal, frail body attempted to wield it, the sheer output of power would blow the user’s limbs completely off. Izuku’s unique mutant-emitter hybrid quirk, Blast-Proof, offered absolute protection from external chemical and quirk-based explosions, but One For All was an internal biomechanical force. If his bones snapped from the recoil of his own muscles, his quirk wouldn't save him. 

He needed to become a proper vessel. 

So, Izuku hauled trash. He pulled tires through the wet sand until his shoulders bled. He pushed pickup trucks until his vision spotted with black stars. He ate massive, protein-heavy meals until he felt sick, and then he went back to hauling more trash. 

Through the autumn chill and the bitter winter frost, Izuku’s body transformed. The soft, round boy who had been mocked his entire life slowly melted away. In his place emerged a young man carved from sheer determination. His shoulders broadened. His arms grew dense with lean, tightly coiled muscle. Calluses formed thick on his palms. 

And on the morning of the Entrance Exam, exactly at 6:00 AM, the beach was spotless. The golden rays of the rising sun reflected off the pristine, rolling waves, illuminating a coastline that hadn't been seen in over a decade. 

Standing atop a massive pile of compressed scrap metal at the edge of the boardwalk, Izuku let out a primal, echoing roar of triumph. It was a sound born of ten months of agony and the sudden, overwhelming realization that he had actually done it. 

All Might, standing in his muscle form, looked up at the boy with profound pride. He plucked a single strand of golden hair from his head. 

"You have done well, young Midoriya," All Might boomed, the ocean breeze catching his oversized shirt. "You have prepared the vessel. Now, it is time to inherit the power. Eat this!"

Izuku had stared at the hair, his triumphant smile dropping into a deadpan grimace. "...Eat it?"

"To inherit the quirk, you must consume some of my DNA! It's not magic, it's science! Now hurry up, you don't want to be late for the exam!"

An hour later, Izuku stood before the towering, gilded gates of U.A. High School. He swallowed hard, trying to ignore the phantom tickle of golden hair in the back of his throat, and the swirling, terrifying knot of pressure building in the pit of his stomach. One For All was inside him now. He couldn't feel it yet—All Might had said it would take a few hours to digest and integrate with his quirk factor—but the psychological weight of it was staggering.

This is it, Izuku thought, clutching the straps of his yellow backpack. The greatest hero academy in the world.

"Out of my way, Deku."

The voice, rough and dripping with familiar venom, sent a spike of adrenaline straight through Izuku’s chest. He turned to see Katsuki Bakugo walking toward the gates. Katsuki’s hands were stuffed deep into his pockets, his posture slouched but radiating intense aggression. 

Ever since the Sludge Villain incident, things between them had been remarkably tense. Katsuki had stopped physically cornering Izuku, but the verbal hostility had somehow sharpened. Katsuki couldn't look at Izuku without remembering the sight of the "useless" boy walking through an inferno to save him. It was a debt Katsuki never asked for, and one he deeply resented.

"K-Kacchan," Izuku stammered, stepping aside. "Good morning."

Katsuki paused, his crimson eyes raking over Izuku’s frame. He noticed the changes. The way Izuku’s uniform shirt pulled slightly tighter across his chest. The way his stance was grounded, rather than shrinking away. It infuriated Katsuki even more. 

"Don't stand in front of me," Katsuki growled, lowering his voice so the other applicants wouldn't hear. "I don't care what kind of weird mutant trick your body pulled that day. You're still a quirkless loser in a fight. You're going to get yourself killed in there. Just go home."

Katsuki shoulder-bumped him as he walked past, marching into the courtyard. 

Izuku watched him go, taking a deep breath. He's trying to warn me, in his own messed-up way, Izuku analyzed. He knows I can't fight back.

Izuku took his first step toward the building, his nerves fraying. He was so caught up in his head that he forgot to lift his foot over the raised concrete lip of the walkway. His toe caught. The world tilted violently forward.

Great, Izuku thought miserably as the pavement rushed up to meet his face. Ten months of intense physical training, and I die by tripping over my own feet.

But the impact never came. 

A few inches from the ground, Izuku’s body halted in mid-air. He floated, entirely weightless, his limbs flailing slightly as he bobbed like an apple in a barrel of water. 

"Are you okay?" a bright, cheerful voice asked. 

Izuku was suddenly righted, his feet touching the ground softly. He spun around to see a girl with short, bobbed brown hair and large, warm brown eyes. She was smiling, holding her hands together, the pads of her fingers pressing against each other. 

"It's my quirk! Sorry for using it without asking, but it would be bad luck to fall right before the exam, wouldn't it?" she laughed, a bright, bubbly sound that instantly cut through Izuku’s anxiety. 

"I—uh—yes! I mean, thank you! I'm fine!" Izuku blurted out, his face rapidly turning the color of a ripe tomato. A girl talked to me!

"I'm super nervous, aren't you?" she continued, completely unbothered by his awkwardness. "Well, let's both do our best! See ya!"

She jogged off toward the auditorium. Izuku stood frozen, his brain rebooting. He had a quirk now. He had muscles. And a girl had just talked to him. For the first time all morning, a genuine smile broke across his face. I can do this.

The massive lecture hall was packed with thousands of prospective students. At the front of the room, standing beneath a barrage of spotlights, was the Voice Hero: Present Mic.

Present Mic explained the rules of the practical exam with explosive enthusiasm. The applicants would be divided into several massive, mock-city battle centers. Their goal was to rack up points by destroying mechanical "Villain Bots." 

"There are three main types of villains in every battle center!" Present Mic shouted, striking a pose. "One-Pointers, Two-Pointers, and Three-Pointers! Each type has a different difficulty level and combat style! Use your quirks to disable them and rack up a high score!"

A tall, stern-looking boy with glasses and blue hair stood up, rigid as a board. "Excuse me! On the printout, there are four types of villains listed! If this is a misprint, then U.A., the most prominent school in Japan, should be ashamed of that foolish mistake!" The boy then turned, pointing a sharp finger directly at Izuku. "And you! With the curly hair! You've been muttering this entire time! It's distracting! If you are here on a pleasure trip, then you should leave immediately!"

Izuku slapped his hands over his mouth, shrinking down into his seat as the hall giggled. Old habits die hard, he thought, mortified. 

"Okay, okay, Examinee Number 7111!" Present Mic placated. "The fourth villain type is worth zero points! It's an obstacle! A massive gimmick that will rampage through the tight urban spaces! When you see it, my advice is to run away! It's not worth your time!"

Izuku stared down at his informational packet. The knot in his stomach tightened again. 

Robots, Izuku thought frantically. I have to destroy robots.

He looked at his hands. He was strong now, yes. He could probably lift a motorcycle. But punching through solid steel plating? That required superhuman strength. It required One For All. 

But he had never used it. All Might had warned him that without practice, unleashing the power could shatter his bones instantly. If he threw one punch and broke his arm, the exam was over. He was completely terrified of the power resting dormant inside his DNA. 

And his natural quirk, Blast-Proof? What good was an immunity to explosions if he had to go on the offensive against machines? 

As he boarded the bus to Battle Center B, Izuku felt the cold, creeping dread of failure seeping into his bones. 

Battle Center B was a breathtakingly massive replica of a dense urban district. Skyscraper facades, alleyways, and paved streets stretched out behind a colossal set of iron gates. 

Dozens of teenagers stood at the starting line, stretching, psyching themselves up, and showing off their quirks. Izuku stood at the back of the pack, sweating profusely. He spotted the brown-haired girl from earlier and took a step toward her, wanting to thank her properly, but he was frozen by the sheer intensity in the air. 

"RIGHT, LET'S START!" Present Mic's voice blasted from hidden loudspeakers. 

Izuku jumped. 

"WHAT'S WRONG? THERE ARE NO COUNTDOWNS IN REAL BATTLES! RUN, RUN, RUN!"

The crowd surged forward, leaving Izuku in the dust. Panic seized him. He sprinted after them, his red shoes slapping frantically against the pavement. By the time he passed through the gates, the battle had already begun.

The sounds of destruction echoed down every alleyway. Explosions of ice, bursts of electricity, and the screeching of tearing metal filled the air. 

Izuku rounded a corner and skidded to a halt. A One-Pointer, a tank-like robot with a single red ocular sensor, was rolling right toward him. 

"Target acquired," the robot droned mechanically, raising a metallic arm. 

Izuku’s heart hammered in his throat. Okay! This is it! Use One For All! Just a little bit!

He clenched his right fist. He squeezed his eyes shut and commanded his body to unleash the stockpiled power. He waited for the surge of energy, the glowing aura he imagined would accompany it. 

Nothing happened. 

The fear was a mental block. His brain, deeply wired for self-preservation, refused to pull the trigger on a power it subconsciously knew would destroy his arm. 

The robot lunged, swinging its metal appendage. Izuku shrieked, diving to the asphalt in a desperate roll. The metal arm smashed into the brick wall behind him, showering Izuku in red dust. 

"I can't do it!" Izuku gasped, scrambling to his feet. "I can't unlock it!"

A beam of concentrated laser light suddenly pierced the robot's sensor, short-circuiting it instantly. The machine collapsed. A blonde boy with a sparkling belt shot past Izuku with a dazzling smile. "Thanks for the distraction, mon ami!"

"Zero points," Izuku whimpered, looking up at the scoreboard projected on a nearby building. The countdown timer read: Six Minutes Remaining.

Desperation clawed at his throat. He ran wildly through the streets, turning down alleys, trying to find a target. But every time he found a robot, someone else destroyed it. The other applicants were ferocious, utilizing their quirks with practiced ease. Izuku was just a normal boy running through a warzone. 

Three Minutes Remaining.

Izuku leaned against a parked, prop car, gasping for air. His legs burned. He had zero points. He was going to fail. After everything All Might had done for him, after ten months of agonizing labor, he was going to walk away with nothing. 

A loud, rhythmic thudding shook the ground nearby. Izuku peeked around the corner of the car. 

Down the main avenue, a Three-Pointer was rolling through the street. It was massive—twice the size of the One-Pointer, with heavy tread tracks and a heavily armored torso. 

But what caught Izuku’s eye were the weapon mounts on its shoulders. 

Izuku’s analytical mind, honed by years of taking notes on pro heroes, snapped into focus. The panic receded, replaced by the cold, calculating hum of his intellect. 

The One and Two-Pointers relied on melee strikes and small laser turrets. But the Three-Pointer was artillery. The shoulder mounts weren't lasers. They were miniature, automated missile pods. 

Missiles, Izuku thought, his eyes widening. Combustion engines. High-yield explosive payloads. 

A memory flashed in his mind. The back page of his charred notebook. Quirk Application: Blast-Proof. Theory 1: Kinetic redirection.

"If my body is in the air, without the friction of the ground anchoring me..." Izuku muttered to himself, his breathing slowing down. "...can I use an explosion to launch myself?"

It was absolute madness. If he miscalculated the angle, the explosion would send him flying into a brick wall, and the blunt force trauma would shatter every bone in his body. 

But One For All wouldn't activate. His fists couldn't break steel. He had three minutes left, and zero points. He had absolutely nothing to lose. 

Izuku stepped out from behind the car, walking into the center of the avenue. 

The Three-Pointer stopped its advance. Its sensor swiveled, locking onto Izuku. 

"Target acquired," the machine boomed. "Lethal force disabled. Commencing suppression fire."

The shoulder pods clicked open. Two miniature missiles, designed to create large, stunning concussive blasts rather than shrapnel, locked onto the boy standing in the street. 

Izuku didn't flinch. He bent his knees, his eyes fixed on the glowing exhaust ports of the missiles. 

Wait for it, Izuku told himself. His heart was a drum in his ears. Wait for the trigger.

FWOOSH.

The missiles fired, streaking through the air toward him, trailing thick white smoke. 

Izuku moved. He sprinted forward, directly toward the missiles. The machine's targeting system hadn't calculated for a suicidal charge. 

Just as the missiles reached a distance of ten feet, Izuku leaped into the air with all the strength his beach-trained legs could muster. He tucked his knees into his chest, entering a tight, aerodynamic ball. 

The missiles flew directly beneath him and struck the asphalt right where he had been standing a millisecond before. 

KABOOM!

The double detonation was spectacular. A massive fireball erupted from the street, instantly vaporizing the pavement and creating a violent, expanding shockwave of kinetic pressure. 

Izuku’s quirk activated instantly. His cellular structure went rigid, his eardrums locked, and his skin became entirely insulated against the searing heat. 

But he wasn't anchored to the ground. 

The shockwave hit him in the back like the hand of a furious god. 

Because his body absorbed no damage from the blast, the pure, unadulterated kinetic energy of the explosion transferred directly into momentum. Izuku was launched out of the smoke cloud like a railgun slug. 

It worked! Izuku’s mind screamed in absolute exhilaration as the wind tore at his face. He was flying at incredible speed, riding the crest of the shockwave straight toward the Three-Pointer. 

The robot's sensors couldn't track a target moving that fast from a dead stop. Before the machine could raise its metallic arms to defend itself, Izuku was upon it. 

He didn't need One For All. He didn't need super strength. 

Physics dictated that Force equals Mass times Acceleration. Izuku’s mass, multiplied by the explosive acceleration of a twin-missile shockwave, turned his entire body into a human bullet. 

Izuku extended his right leg at the last possible second. 

CRASH!

His foot struck the center of the Three-Pointer’s armored chest. The sheer kinetic transfer buckled the reinforced steel plating instantly. The robot was violently thrown backward by the impact, its internal circuitry shattering under the force. It skidded across the pavement, sparks flying in a fountain of destroyed metal, before grinding to a halt, completely decimated. 

Izuku bounced off the chassis, tumbling across the asphalt. He scraped his elbows and bruised his shoulder—the blunt force trauma of the fall hurting exactly as a normal fall would—but he quickly rolled to his feet, panting heavily. 

"Three points," Izuku gasped, looking at the smoking wreckage. A wild, adrenaline-fueled grin broke across his face. "I can fight. My quirk... it’s not just a shield."

He didn't wait. He sprinted down the street, his ears straining for the sound of heavy artillery. 

He found another Three-Pointer a block away, engaged with the boy with the engine-legs. Izuku didn't hesitate. He vaulted off a rusted fire hydrant, throwing himself into the air just as the robot fired a missile at the ground to scatter its attackers. 

Izuku positioned himself perfectly in the air above the blast radius. 

BOOM!

The shockwave caught him, hurtling him forward. This time, he grabbed a loose piece of heavy rebar from the destroyed pavement as he flew, using the explosive momentum to drive the steel rod straight through the robot's ocular sensor like a javelin. 

"Six points!" Izuku shouted. 

The blue-haired boy stared at Izuku as he landed smoothly on the chassis. "What kind of reckless, self-destructive quirk is that?!" the boy yelled. "You're throwing yourself into explosions!"

"It's only self-destructive if it hurts!" Izuku yelled back, immediately taking off again. 

He was a blur of motion. Every time a Three-Pointer fired an explosive, Izuku was there, treating the deadly ordnance like personal jump-pads. He rode the shockwaves off walls, propelling himself in erratic, unpredictable zig-zags. He used the explosions to launch himself to the tops of the mock buildings, dropping down on Two-Pointers with massive kinetic strikes. 

He wasn't fighting like a traditional brawler. He was fighting like a pinball, using the enemy's heaviest firepower to keep himself in motion. He felt completely alive. He felt untouchable. 

"Twenty-four points! Twenty-seven points!" 

"Two minutes remaining!" Present Mic's voice echoed over the city. 

Izuku landed on a rooftop, wiping a streak of soot from his forehead. Twenty-seven points. It wasn't a staggering amount, but it might be enough to pass the written margin. He just needed to find a few more. 

Suddenly, the city stopped. 

The ground didn't just shake; it violently convulsed. The buildings groaned, their windows shattering from a low, rhythmic vibration that seemed to emanate from the very core of the earth. 

A shadow fell over the entire district. 

Izuku slowly turned his head. At the far end of the main avenue, the skyline was being eclipsed. A hand the size of a city block slammed down onto the roof of a five-story building, crushing it into dust instantly. 

The Zero-Pointer. 

It wasn't a robot. It was a walking skyscraper. Its single red eye burned through the dust cloud like a miniature sun. 

"Less than two minutes left!" Present Mic yelled. 

Total panic erupted in the streets below. The applicants abandoned their fights, turning and sprinting away from the colossal behemoth. It was an obstacle meant to test their flight response, and it was working perfectly. 

Izuku stood frozen on the rooftop. Every instinct in his body screamed at him to run. The Zero-Pointer was too big. If that hand hit him, his quirk wouldn't save him. He would be squashed like an insect. 

He turned to run, to join the retreating crowd. 

"Ow!" 

The sound was small, almost drowned out by the grinding gears of the behemoth, but Izuku’s ears caught it. He stopped, looking down at the street. 

The brown-haired girl—the one who had saved him from falling—was trapped. A massive chunk of debris from a shattered building had pinned her leg to the ground. She was struggling frantically to push it off, but it was too heavy. 

And the Zero-Pointer’s massive treads were rolling directly toward her. 

Izuku’s heart stopped. The other applicants were running right past her, consumed by the panic of the ticking clock and the sheer terror of the machine. No one was stopping. 

The Zero-Pointer paused. Its chest plates began to shift and separate, revealing a honeycomb of massive, military-grade missile silos. 

"Area clearing protocol initiated," a voice boomed from the machine, shaking the air. 

It's going to fire, Izuku realized with absolute horror. It's going to carpet-bomb the street to clear the debris.

If those missiles hit the ground near the girl, she wouldn't survive. She didn't have his quirk. The heat alone would incinerate her. 

Without a single thought, without a shred of hesitation, Izuku threw himself off the roof. 

He didn't calculate the physics. He didn't think about One For All. He just saw someone who needed saving, and his legs moved. 

He landed on the asphalt, sprinting toward the girl. 

"Hey!" she cried out, looking up at him with tear-filled eyes. "Run! It's going to fire!"

"I'm not leaving you!" Izuku roared. 

High above, the Zero-Pointer unleashed its payload. A dozen massive missiles, each the size of a car, arced into the sky and began their rapid descent, raining down on the avenue. 

Izuku reached the girl, but there was no time to lift the rubble. The missiles were seconds away from impact. 

He stood directly over her, planting his feet on either side of her trapped body. He crossed his arms over his chest, looking straight up at the falling ordnance. 

"Close your eyes and cover your ears!" Izuku screamed at her. 

She screamed, burying her face in her arms as the sky turned to fire. 

The first missile struck a building twenty feet to their left. The explosion was titanic, turning the concrete into a spray of shrapnel. 

The second, third, and fourth missiles hit the street in a rapid, deafening staccato. 

KABOOM! KABOOM! KABOOM!

The avenue became a localized apocalypse of fire, smoke, and expanding shockwaves. The heat was enough to melt the asphalt. 

Izuku stood his ground. His Blast-Proof quirk flared into overdrive. The shockwaves battered against his body from all sides, but he used his own musculature to anchor himself against the intersecting blasts, ensuring he wasn't thrown backward. The flames washed over his skin, leaving him completely unharmed. The deafening roar was silent to his locked eardrums. 

He became a human umbrella. The concussive forces that should have pulverized the girl beneath him hit Izuku and broke around him like water hitting a boulder, creating a small, triangular pocket of safety directly beneath his stance. 

The girl opened her eyes, gasping in shock. She was surrounded by a raging firestorm, but the heat wasn't touching her. The shockwaves were tearing up the street just feet away, but the air around her was perfectly still. She looked up and saw Izuku, bathed in the blinding light of the explosions, standing immovable. 

But the barrage wasn't over. 

The Zero-Pointer targeted the largest piece of debris—the very rubble trapping the girl—and fired its main, central warhead directly at it. 

Izuku looked up as the massive missile descended. 

If that hits the rubble directly, the blunt force of the shattered concrete will kill her, even if I block the explosion! Izuku realized. 

He had to intercept it. He had to stop the missile before it hit the ground. 

He looked at the raging fires around him. He felt the intense, intersecting kinetic pressure of the ongoing explosions. 

Theory 1, Izuku thought. Let's take it to the absolute limit.

"Hold on!" Izuku yelled to the girl. 

He uncrossed his arms. He intentionally relaxed his stance, allowing the immense, compounding shockwaves of the surrounding explosions to catch his body. 

He jumped. 

The localized firestorm funneled its kinetic energy into him. The sheer force of the intersecting blasts launched Izuku into the air like a rocket, straight up toward the descending main warhead. 

He was flying faster than he ever had. The wind tore the breath from his lungs. The colossal face of the Zero-Pointer loomed above him, blocking out the sun. 

Izuku soared directly into the path of the falling warhead. 

He didn't try to dodge. He met the tip of the missile head-on with his chest. 

KABOOOOM!

The main warhead detonated in mid-air. The explosion was a blinding sphere of white-hot plasma that illuminated the entire battle center. The pro-heroes in the observation room gasped in horror, watching the screen as the applicant intentionally body-blocked a heavy-artillery strike.

But out of the smoke, Izuku emerged. 

The explosion hadn't hurt him. But the immense, concentrated concussive force of a warhead detonating point-blank against his chest in mid-air gave him an impossible amount of upward momentum. 

He didn't just ride the shockwave; he surfed the apocalypse. 

He rocketed upward, breaching the cloud of smoke, ascending hundreds of feet into the air until he was perfectly level with the Zero-Pointer’s massive face. 

For the first time since the exam began, Izuku felt a shift deep inside his chest. 

It wasn't a spark. It was a sun going supernova. 

The fear was gone. The hesitation was eradicated. He was staring down a giant, and his body finally understood that the time to hold back was over. The power of One For All—the stockpiled energy of generations—responded to his absolute, fearless intent. 

Red, vein-like lines flared to life beneath his skin, glowing with fierce, radiating power. The energy surged through his veins, rushing down his right arm, filling his muscles with pressure so immense it felt like his arm would explode from the inside out. 

Izuku pulled his fist back. The air around his arm warped and distorted, crackling with raw, unbridled kinetic energy. 

"SMAAAAAAASH!" 

Izuku threw the punch. 

His fist connected with the thick, reinforced steel plating of the Zero-Pointer’s face. 

The impact defied physics. The sheer force of One For All rippled outward in a visible shockwave of compressed air. The steel didn't just bend; it completely disintegrated. The force traveled through the robot's head, down its spine, and into its core, violently rupturing the machine from the inside. 

The colossal Zero-Pointer, a machine the size of a building, was violently thrown backward by a single punch from a teenage boy. It crashed onto the fake city street with a sound that shook the very foundations of U.A. High School, entirely decimated. 

Izuku hung in the air for a fraction of a second, his fist still extended. 

Then, the pain hit him. 

It was absolute agony. His right arm was shattered, the bones splintered into a thousand pieces from the sheer recoil of his own unleashed strength. Both of his legs, which had channeled the energy of the launch, felt broken and useless. 

My quirk only protects me from explosions, Izuku thought hazily, the adrenaline fading into blinding pain. It doesn't protect me from my own power.

Gravity reclaimed him. He began to fall. 

He was hundreds of feet in the air. The ground was approaching fast. He couldn't move his arms. He couldn't move his legs. 

I'm going to die, Izuku realized, the wind rushing past his ears. I saved her. I destroyed it. But I can't survive the fall.

He closed his eyes, preparing for the inevitable blunt force trauma. 

Suddenly, a hard slap struck his cheek. 

The descent stopped violently. Izuku gasped, his eyes flying open. He was floating again, mere inches from the shattered pavement. 

The brown-haired girl was standing over him, her face pale, panting heavily. She had dragged herself out from under the rubble while he was fighting, and pressed her fingers together just in time. 

"Release!" she gasped. 

Izuku dropped the remaining few inches, hitting the ground with a soft thud. 

The buzzer blared across the battle center. 

"TIME'S UP!" Present Mic announced. 

The girl collapsed to her knees, vomiting from the extreme nausea caused by overusing her quirk. 

Izuku lay on his back, staring up at the clear blue sky. His body was broken. He was in more pain than he had ever experienced in his life. 

But as he looked at his right arm, mangled and bruised, a quiet, tearful laugh bubbled up in his chest. 

He hadn't run away. He had used his quirk to tank the heaviest firepower U.A. had to offer, and he had used All Might's power to finish the job. He was a shield, and he was a sword. 

"I did it..." Izuku whispered, before the darkness finally overtook him, pulling him into unconsciousness. 

A week later, Izuku sat at his desk in his bedroom, staring intently at a sealed envelope resting on the wood. The U.A. wax seal seemed to mock him. 

The healing process had been bizarre. Recovery Girl, U.A.’s resident healer, had kissed his forehead, forcefully accelerating his body's natural healing factor. His arm was repaired, but he had been exhausted for days. 

He was terrified of what was inside the envelope. He had scored twenty-seven combat points. Based on historical data, that was rarely enough to pass. The Zero-Pointer was worth exactly zero points. He had broken his body for nothing but his own morals. 

His door burst open. Inko Midoriya slid into the room, tears already streaming down her face. 

"Izuku! It's here! The letter!" 

"I know, Mom," Izuku said softly. 

He picked up the envelope and carefully tore it open. Instead of a letter, a small, metal disc slid out, clattering onto the desk. 

Suddenly, a holographic projection sprang to life, illuminating the dim bedroom. 

"I AM HERE AS A PROJECTION!" All Might’s voice boomed from the device. 

Izuku gasped, pushing his chair back. 

"Young Midoriya!" All Might smiled, looking directly into the camera. "You did well on the written exam! But your practical score was... twenty-seven points. Unfortunately, that is not enough to pass the combat threshold."

Izuku’s heart plummeted into his stomach. He felt the tears welling up. I failed. I actually failed.

"However!" All Might continued, raising a finger. "Combat points are not the only metric we observe at U.A. High School! Watch this!"

The hologram shifted, displaying a video feed. It was the brown-haired girl, standing in front of Present Mic. 

“Excuse me,” the girl said in the recording. “The boy with the curly hair and the freckles... he saved my life. He threw himself into those missiles for me. If he doesn't have enough points, can you give him some of mine?”

Izuku stared at the projection, his breath catching in his throat. 

"A hero course that rejects those who do the right thing when lives are on the line is no hero course at all!" All Might proclaimed, his voice thick with emotion. "This is a job that requires risking one's life to put others first! That is why we have a secret metric, judged by a panel of teachers!"

The screen flashed, displaying a scoreboard. 

IZUKU MIDORIYA. 

COMBAT POINTS: 27.

RESCUE POINTS: 60.

TOTAL: 87 POINTS.

"Sixty rescue points!" All Might laughed triumphantly. "You placed first in the exam, Young Midoriya! You pushed past your limits, utilized your quirk brilliantly, and embodied the true spirit of a hero!"

The hologram shifted back to All Might, who extended a hand toward the camera. 

"Come, Izuku Midoriya. This is your Hero Academia."

The projection fizzled out, leaving the room in silence. 

Izuku stared at the empty desk. The tears that had been building finally spilled over, falling hot and fast down his cheeks. He wasn't crying from sadness, or fear, or the crushing weight of being useless. 

He gripped his desk, his shoulders shaking with absolute, unbridled joy. 

He was going to U.A. He was going to be a hero.