The air in the subterranean residential sector of the Hero Public Safety Commission's central facility smelled sharply of ozone and distilled water, cycling endlessly through heavy industrial conduits. The Commission's reports called it an optimal atmospheric environment. Nezu preferred a more accurate term: a vault.
He walked with a light, measured step, his polished black shoes clicking softly against the reinforced ceramic flooring. Beside him strode Officer Tagawa, a senior HPSC liaison encased in a white, space-grade hazardous environment suit that hummed with internal climate controls. Tagawa's face was entirely hidden behind a gold-tinted, polarized polycarbonate visor—a permanent, physical reminder of the boundary the Commission maintained between its staff and its assets.
"I want to be entirely clear, Principal Nezu," Tagawa said, his voice flat and tinny through the suit's comms speaker. "The accommodations we provided are state-of-the-art. He has had access to high-speed data terminals, a complete library of accredited digital curricula, recreational systems, and a fully stocked culinary dispensary operated via automated airlock. We are not running a dungeon here."
Nezu kept his paws tucked neatly behind his back, his dark, intelligent eyes scanning the seamless, titanium-reinforced walls.
Oh, I am well aware, Tagawa-san, Nezu thought, though he only replied with a light, breezy hum. The Commission has always prided itself on its hospitality. A golden cage is, after all, still a cage. But it is remarkably well-upholstered.
"He is sixteen years old," Tagawa continued defensively, his posture rigid. "When his Quirk manifested a decade ago, regional containment protocols dictated strict isolation, but we adapted. We carved out this entire subterranean wing specifically for him. If we are releasing him into a public high school now, it is only because psychological models indicate that absolute isolation is beginning to yield diminishing returns on his stability."
Translation, Nezu noted with a quiet inward sigh, the box is starting to crack from the inside, and you're hoping a school full of teenagers can absorb the shockwave before he combusts.
Tagawa stopped before a heavy, pressure-sealed door marked Sector-Zero: Hoshino, pressed a thick, insulated glove against the biometric scanner, and unlocked it.
With a deep, pneumatic hiss, the heavy door slid open.
A wave of dry, uncomfortably heavy heat rolled out into the hallway. It wasn't a vaporizing blast, but the thick, shimmering sensation of walking straight into a sauna.
Nezu stepped past the threshold without hesitation. His sharp gaze bypassed the luxurious minimalist decor—the bed, the desk, the digital screens, the window looking out into a pitch-black bedrock shaft—and locked immediately onto the boy standing beside the desk.
Taisei Hoshino.
Even frozen mid-motion, the boy commanded an instinctive, heavy gravity. His hair was a chaotic, brilliant shock of pale, luminous blonde that scattered the room's light like a corona. His skin was stark, porcelain white, contrasting sharply with the bright, high-collared blue uniform jacket he wore—a garment heavily laced with Class-4 thermal-dampening mesh and kinetic-sink plating.
Wrapped snugly high against his throat, cutting a harsh, geometric line of matte-black metal across his skin, was a heavy quirk-suppression collar. A single, small status light glowed a steady red right in its central module, pulsing like an artificial heartbeat that marked the exact boundary of his confinement.
Most striking were his eyes. When he looked up, they blazed with a steady, non-blinking white-hot brilliance.
Nezu's experienced eye took in the physics of it instantly. The Class-4 gear and suppression collar were marvels of engineering, keeping the exterior fabric cool enough to touch and preventing the room from scorching. But the thermodynamics of a stellar singularity meant the system couldn't catch everything. Anyone stepping within a meter of him entered a permanent personal heatwave. And beneath that protective weave, his actual bare skin remained a literal stellar surface—unmitigated contact was still strictly fatal.
For a second, nobody moved in the heavy air. Then, Taisei stiffened, dropping into a posture of rigid, rehearsed compliance. He placed his palms flat on the desk, keeping a safe distance from the edge.
"Principal Nezu," Taisei said, his voice carrying a resonant, low-frequency hum that vibrated in the chest. "And... Officer Tagawa. Good morning. I was not informed that my transfer review was scheduled for this hour."
"An impromptu visit, Hoshino-kun," Nezu said cheerfully, walking further into the room and making himself comfortable on a small stool just outside the heavy thermal radius. "I wanted to see the living quarters of my newest student before the morning rush. How are you holding up this morning?"
"My vitals are within acceptable parameters, sir," Taisei recited.
Nezu watched him closely. There was no teenage slouch, no casual rebellion—just a rigid, white-knuckled stiffness. It was the posture of a sixteen-year-old boy who had spent ten years internalizing the terrifying weight of his own biology, terrified that any sudden emotional slip would prove everyone right about what he was.
"As you can see, Principal Nezu, he is disciplined," Tagawa stated from the doorway. "He understands the danger of his existence. The Class-4 gear and suppression collar keep his baseline stable enough to prevent accidents during normal interactions."
Nezu didn't look at the liaison. He kept his eyes locked on Taisei, noticing the subtle, nervous twitch of the boy's fingers against the wood.
"The suit and the collar are very good at keeping people safe, Hoshino-kun," Nezu said softly, drumming his paws gently against his knees. "They're tidy. They do the job. But tell me... when was the last time you shook someone's hand without a layer of heavy mesh between your skin and theirs?"
Taisei blinked, the luminous glow of his eyes dimming by a fraction as a flicker of raw, uncomfortable vulnerability crossed his sharp features.
"I'm not... I'm not allowed to," Taisei muttered, his gaze dropping to the edge of the desk. "The handlers drilled it into me, but it's not just a rule. If I touch someone without the gear, they burn. Not just a blister—the thermal shock would destroy their skin. I haven't held a hand or felt a bare shoulder since I was four years old."
"Four years old," Nezu murmured, his paws going still on his knees. "That's an awfully young age to learn that your own body is something people have to be protected from."
Taisei swallowed hard, his jaw tightening. "It keeps everyone safe. That's what the Commission says."
The room went entirely silent, save for the low, rhythmic thrum of the air scrubbers.
Then, beneath the heavy sleeves of Taisei's uniform jacket, the air violently shimmered. Nezu watched the boy stiffen, every line of his posture broadcasting a sudden, crushing spike of blind panic—the raw, defensive terror of a creature forced out of the dark and truly seen. For a fraction of a second, the light around Taisei's knuckles warped into a pitch-black, light-swallowing micro-shadow. A fracture. A volatile glitch where the star inside him threatened to cave inward.
Tagawa instantly tensed, his gloved hand flying to an override switch on his belt. "Hoshino. Pull it back. Contain it."
Taisei squeezed his eyes shut. His teeth gritted until his jaw ached, forcing himself into the rhythm of the box-breathing drilled into him since childhood. In for four. Hold for four. Out for four.
Slowly, agonizingly, Nezu watched the dark anomaly at the boy's knuckles swallow itself back into his skin. The blinding white glare of Taisei's hair and eyes flared, then settled back into a steady, resting hum.
Taisei let out a long, shuddering breath, his shoulders hunching under the exhaustion of it. "I cannot do that, Principal Nezu," he whispered, his voice finally cracking, dropping all the robotic discipline. "The suit keeps people safe from my ambient heat, but it doesn't stop what happens inside my head when I'm overwhelmed. If I panic in a crowded hallway... if the pressure builds past what the kinetic-sink plating can absorb... someone is going to get hurt."
"Yes," Nezu agreed cheerfully, watching the panic recede into sheer exhaustion. "High school is a remarkably volatile place, even on a good day. Class 1-A has already survived villains, structural collapses, and enough explosive egos to power a small city. Adding a little extra heat to the back row is just keeping things interesting."
Tagawa stepped forward, his suit whirring angrily. "Principal Nezu, with all due respect, the Commission's directive—"
"The Commission's directive is currently sitting in my briefcase," Nezu interrupted smoothly, never breaking eye contact with the boy.
Nezu reached into his jacket and pulled out a single, crisp sheet of paper, placing it gently on the corner of Taisei's desk. The crimson seal of U.A. High School gleamed against the white surface.
"Here is my proposition, Hoshino-kun," Nezu said softly. "You can stay here. You can spend the next fifty years in this immaculate, climate-controlled suite, playing video games and speaking exclusively to people in space suits. You will be safe. The world will be safe from you. And when you die of old age, the HPSC will quietly decommission this room and pretend you never existed."
Taisei stared at the paper. The white-hot light reflecting off its surface made the ink dance.
"Or," Nezu continued, his voice dropping into a register of absolute, unyielding seriousness, "you can pack a single duffel bag, step out of this door, and walk right into Class 1-A. You'll get a desk in the back corner. People can stand next to you—they'll feel like they're sitting in a sauna, sure, but they'll be safe. You'll study calculus, hero law, and rescue tactics just like everyone else. And I won't lie to you: you are going to be terrified every single second of the day. So will your homeroom teacher, Mr. Aizawa."
Nezu offered a small, reassuring smile.
"It will be loud. It will be messy. You will probably sweat through your uniform shirts and annoy your classmates with how much heat you radiate. But you will learn how to exist in the world without being afraid of your own shadow. I am offering you a classroom, Taisei. What do you say?"
The silence returned, but this time, it didn't feel suffocating. It felt heavy with a terrifying, open-ended future.
Nezu watched as the boy looked down at his hands—hands that could turn matter into gas with a single careless slip, hands that hadn't touched another human being in a decade. He watched the quiet war wage behind those blazing white eyes.
Slowly, deliberately, the stellar glow in Taisei's eyes flared—not with the jagged panic of a fracture, but with a steady, fierce, resolute ignition.
His fingers reached out, hovering just above the desk before gripping the edge of the enrollment form. The paper curled slightly under the ambient heat radiating from his fingertips, browning at the very edges before he pulled his hand back with a sharp gasp.
"I'll need... I'll need extra dampeners for my jacket seals," Taisei murmured, his voice trembling with the raw, terrifying weight of a choice he had made entirely on his own. "And a desk that isn't pressed right against the radiator."
Nezu chuckled, pulling a small, metal-cased thermos from his coat and setting it down. "Consider it done. Pack your bag, Hoshino-kun. The car is waiting upstairs."
Taisei nodded, turning away from the desk to pull a dark canvas duffel bag from the minimal closet.
As the boy began to pack, Nezu lingered by the doorway, a quiet satisfaction settling in his chest. The air in the room was still thick and shimmering with the volatile signature of a compressed star. But as Taisei zipped the duffel bag shut and turned back toward the open door, Nezu knew the boy had already taken the hardest step of all.
The door slid open further, revealing the long, bright, unshielded hallway leading upward—away from the subterranean bunker, and out toward the blinding, unpredictable expanse of the world above.