At ten years old, Shin Karasuma wasn't just different—he was magnetic.
He stood a little taller than most of his classmates, his lean frame shaped by years of morning workouts and nightly discipline. His hair was thick and dark, always slightly messy in a way that somehow made it look intentional, and his eyes—sharp, green, alive—seemed to read more than they let on. His face had the striking charm of a young Eren Yeager, but with a softer edge—cuter, more expressive, and disarmingly handsome.
Teachers loved him. Classmates gravitated toward him.
He was the kind of kid who offered his umbrella on rainy days, shared snacks even when he only had one left, and remembered everyone's birthdays. But behind those bright smiles and easy laughter… was a storm.
---
Shin was brilliant, and everyone knew it.
Perfect scores in every subject. Top of the class. Quick with answers, patient when helping others. But he never lorded it over anyone—he lifted people up. Kids would come to him before exams, asking for help. And he'd always say yes, kneeling beside their desks with a pencil behind his ear and a warm grin on his face.
"Let's figure it out together," he'd say.
To them, Shin was the ideal friend. Smart, kind, reliable.
But none of them saw the other notebook. The one hidden inside his backpack, stuffed between his textbooks and neatly folded PE clothes. The one filled with tactical analysis, lightning output tests, movement grids, and simulations of hypothetical villain encounters.
Because Shin Karasuma wasn't just trying to be the best in class. He was training to rewrite fate.
---
During lunch, he didn't eat alone. He laughed with his friends, joined soccer games, shared his notes with the quieter kids. But sometimes, when the others weren't looking, his eyes would drift upward—toward the sky, toward the future.
'Four more years until Midoriya's story begins. That means five until UA's entrance exam. The timeline's moving. I need to move faster.' Shin thought
Later that night, when his friends were playing video games or asleep in bed, Ren would be in his backyard, sparks dancing over his arms, counting seconds between bursts, training with quiet fury beneath the moonlight.
The world saw a kind, brilliant boy.
But in the shadows?
A hero was charging.
******
Shin Karasuma's life wasn't all secrets and strategy.
Even a reincarnated kid genius needed people who made him feel normal—people who didn't look at him like a prodigy, or a future hero, but just… a friend.
He had that. Three of them, to be exact.
Yuki, the loud one. Quirk: "Boom Voice." She could shout loud enough to shake windows if she got too excited—but she was always smiling, always moving. The kind of girl who made even boring days feel like a festival.
Toma, the lazy genius. Quirk: "Sleep Cycle." He got stronger the longer he stayed awake, but he was always on the edge of passing out. Smart as hell, but he'd rather nap on the roof than finish his homework unless Shin dragged him into it.
And Shiro, the quiet type. Quirk: "Glasswalk"—he could turn his body nearly invisible for a few seconds at a time. Sneaky, polite, and always watching. He didn't talk much, but when he did, it mattered.
They were weird. But they were his weird.
---
"Shin," Yuki groaned, slumping across her desk. "You got another perfect score on hero history. What are you, like, secretly thirty?"
"Forty, actually," Shin replied with a completely straight face, flipping his pencil between his fingers. "My skincare routine is just superior."
"Liar," she snorted, throwing a crumpled paper ball at him. "Tell me how you remembered all those quirk laws from 2053!"
"I made a song out of them," he said, tapping the desk like a drum. "Wanna learn it?"
"Nope. You're a menace."
Toma yawned loudly from his chair, arms crossed behind his head. "I'd remember too if you made me a study song, bro…"
Shin smirked. "You were asleep. Again."
"Not true," Toma said without opening his eyes. "I was just… strategically reserving brainpower."
"Is that your quirk or just an excuse?" Shiro muttered from beside them, sketching something in his notebook.
Shin laughed, eyes warm. "Don't encourage him, Shiro."
Their banter carried through the lunch break, loud and chaotic—but comforting. Like a routine they didn't realize they needed.
They weren't just classmates.
They were becoming a team.
---
Later that day, the four of them sat in the school courtyard under the trees, finishing up their snacks.
"So," Yuki said suddenly, eyes gleaming with mischief. "We're gonna be pro heroes together, right? Like, the coolest team ever?"
"Only if Toma's allowed a nap room at HQ," Shin joked.
"Deal," Toma said instantly.
"I'll handle recon," Shiro added, just as calm as ever.
"And you, Shin?" Yuki asked, nudging him with her elbow. "What kinda hero are you gonna be?"
He paused for half a second—long enough to feel the weight of another life behind his eyes.
Then he smiled, easy and genuine.
"The kind who's there when it counts."
Yuki leaned back on her hands, looking up at the sky through the tree branches. "The kind who's there when it counts, huh? That's pretty cool, Shin. Sounds like something a main character would say."
Shin chuckled, rubbing the back of his neck. "Yeah? Well, let's hope I get the good soundtrack when things get serious."
"I want explosions in mine," Yuki grinned. "Like—BOOM—every time I pose."
Toma opened one eye lazily. "You'll scare civilians, not inspire them."
"Let me dream, nap boy."
Shiro spoke up, voice soft but clear. "I think… I just want to help people without them even knowing. Be the quiet type. The one who watches the shadows."
Shin turned to him with a small smile. "You'd be amazing at that, Shiro. Like a silent guardian."
Yuki smirked. "Then what about Toma? He's just gonna sleep through the villain attacks?"
"I don't sleep through them," Toma yawned. "I absorb energy. Big difference."
Shin laughed again. These little moments—they were genuine. Warm. For a while, they made him forget the weight of reincarnation, of timelines and villains and the heavy names of people he hadn't even met yet.
But it also reminded him why he was here.
These people—his friends—they weren't just side characters. They were real. And they deserved a future where they could keep laughing like this.
He looked at them—Yuki's spark, Toma's weird brilliance, Shiro's quiet depth—and felt something settle in his chest.
I'll protect this.
No matter how far off the storm was, no matter how hard he had to train or how much he had to hide… Shin would face it. For them. For the world. For himself.
---
Yuki snapped her fingers in front of him. "Hey, space cadet. You okay?"
Shin blinked. "Yeah. Just thinking."
Toma grinned. "That's dangerous. Don't overheat."
"Too late," Yuki teased. "He's already short-circuiting from being too cool."
They all burst into laughter again. The sky above them burned gold as the sun dipped lower.
And in that moment, Shin Karasuma wasn't a reincarnator.
He was just a boy with friends, chasing a dream he refused to let go of.
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