Reborn in JJK with Schrödinger’s Power

Yuu blinked a few times, trying to make sense of the strange ceiling above him. It wasn't the usual cracked paint of his old room. This one was pristine, white, and... unsettlingly clean.

"Where the hell am I?" he muttered, sitting up. A wave of dizziness hit him, but he pushed through it. The last thing he remembered was spinning a wheel and that weird glowing figure.

His gaze fell on a nearby mirror, and curiosity got the better of him. As he stumbled over to it, his reflection stopped him dead in his tracks.

"Wait... is that me?"

The person staring back was familiar but... better. His messy hair was now neatly cropped, his face sharper, and his body looked like he'd actually seen the inside of a gym. He did a quick once-over, standing tall. "Six-one? Not bad. Not bad at all."

Then his eyes landed on a uniform neatly draped over a chair by the mirror. The name tag read: Itadori Yuu

"Itadori?" His brain clicked, and his stomach dropped. "No way... I'm Yuji's brother?"

He sat back on the bed, the weight of realization hitting him like a truck. Memories of the Jujutsu Kaisen world flashed through his mind—the curses, the chaos, the insanity that Yuji was about to dive into. And now he was here, one year before it all began.

"This is either the best chance ever... or the worst nightmare."

Yuu rubbed his temples, forcing himself to calm down. He needed answers. His eyes scanned the room until they landed on a small desk. A neatly folded newspaper caught his attention. Grabbing it, he quickly found the date.

"One year before everything starts," he whispered. "Alright, one year to figure this out."

He put the newspaper down and took a deep breath. If he was here, he had to make the most of it. And step one was figuring out that power the wheel had given him.

The room was simple, but the details were starting to stand out. A bookshelf filled with textbooks caught his eye, and a small plant sat on the windowsill, basking in the sunlight. It felt lived in—not his life, but someone's. A knot of unease settled in his stomach. He was living someone else's story now.

Closing his eyes, Yuu focused. At first, nothing happened, but then a faint hum buzzed through his body, like a second heartbeat. A glowing screen popped up in front of him, floating mid-air.

Name: Yuu Itadori

Age: 17

Height: 6'1"

Power: Schrödinger's Sovereignty

"That's it?" Yuu squinted at the screen, poking at it with his finger. His hand went right through. "No details? No tutorial? Come on, at least give me a hint!"

The screen flickered for a moment, but nothing else happened. Yuu sighed, dismissing it with a wave. "Great. I have a cool-sounding power and no clue how to use it. Typical."

He slumped back into the chair by the desk, staring out the window. The quiet neighborhood outside looked normal, but he couldn't shake the feeling that things would get messy soon. He had one year to prepare—one year to figure out his powers, connect with Yuji, and get ready for the chaos.

The sunlight streaming in through the window felt warm, almost too comforting given the weight of the situation. Yuu's eyes drifted toward the streets below. Kids were riding bikes, and a few old ladies were chatting near a corner shop. It looked so normal that for a moment, he forgot where he was.

He got up and paced the room, the wooden floor creaking softly beneath his feet. His thoughts kept returning to Yuji. How much did Yuji know right now? Probably nothing—just a normal kid with no idea what was coming. Yuu's fists clenched. He had one year to make sure Yuji didn't face this alone.

His stomach growled, cutting through the heavy thoughts. He glanced toward a small table where a neatly packed lunchbox sat. The sight surprised him—likely his grandpa's handiwork. It was a small but comforting reminder that he wasn't alone here, even in this strange new reality.

As he ate, Yuu's thoughts began to form clearer plans. Training. Familiarizing himself with this world. Learning about curses and how to survive them. One year felt like both an eternity and a fleeting moment. He needed to use every second wisely.

After finishing his meal, he stood by the window again, watching the world outside. A faint chill ran down his spine, and his eyes narrowed. Something didn't feel right. The street below was still, almost unnaturally so. His gaze flicked toward the shadows near a lamppost, but there was nothing there.

"Paranoia already?" he muttered, shaking his head. But the unease lingered, like an itch he couldn't scratch.

"One thing at a time," he muttered, standing up and stretching. The world outside might seem normal now, but he knew better. Beneath the surface, curses and danger were already lurking. He couldn't afford to waste this chance. "Let's get to work."