"I always knew I'd die in a stupid way," muttered Ren, standing in the middle of the road, staring at the oncoming truck.
The truck wasn't slowing down.
The cat in his arms meowed once.
And then—impact.
A flash of pain. Then cold.
And silence.
Ren Takahashi opened his eyes.
The sky above him was pale gray. Rain drizzled lightly, but he wasn't wet. His body felt strange—weightless and heavy all at once. There was no blood, no pain, no sign of the truck that had flattened him like a used soda can. But there was definitely a ceiling now.
A ceiling?
He sat up. Wood-paneled walls surrounded him. Tatami mats cushioned his hands. On a low table nearby sat an old-style mirror with paper charms stuck to it. Traditional Japanese room.
"…What the hell?" he croaked. His voice sounded younger.
Then the pain came.
A tsunami of information crashed into his brain, like memories forced through a straw: Names, faces, places he'd never been—but now remembered. Words like "Cursed Energy," "Tokyo Jujutsu High," "Gojo Satoru," and "Special Grade" anchored themselves into his consciousness.
His name was still Ren. But now, Ren Takahashi, a student sorcerer at Tokyo Jujutsu High. Semi-Grade 2. Age 17. He had something called an Innate Technique—Shin'en no Yoake, "Dawn of the Abyss."
He remembered dying.
His fingers trembled. He raised his palm—and a shimmer of dark, glowing water coiled from his skin. It hissed faintly, unnatural and dense, floating midair like a serpent of neon-blue ink. Ren stared.
"Oh. I'm in an isekai."
A pause.
"…Isekai'd into freaking Jujutsu Kaisen?!"
Two hours later, Ren sat cross-legged in front of the most obnoxiously powerful man he'd ever seen: Gojo Satoru.
Six-foot-something. Snow-white hair. Blindfold. Smug.
"I heard you woke up early," Gojo said cheerfully, spinning a lollipop in his mouth. "You weren't supposed to regain consciousness for another week. Good thing I made time for you."
"I just died yesterday. So forgive me if I'm not thrilled to be speedrunning the afterlife."
Gojo grinned wider. "Good. You've got a mouth. Sorcerers without attitude tend to die early."
Ren frowned.
"I thought I was already a sorcerer?"
Gojo leaned in, elbows on his knees. "You're a natural. You've got an Innate Technique no one's ever seen before. You woke up cursed perception levels that are already higher than most Grade 1s. And get this—when we found you, your cursed energy was reconstructing your body from the inside out. That's why we brought you in."
Ren looked at his hands again. The cursed water flickered faintly around his fingertips. He could feel it—not just as a technique, but like an extension of his soul. It pulsed with depth, like an abyss waiting to swallow light.
"I didn't ask for this."
Gojo shrugged. "Neither did I when I got these eyes. Life sucks. Have some candy."
He tossed Ren a strawberry lollipop. Ren missed, and it bonked off his forehead.
Gojo tilted his head. "You know, you really remind me of someone."
"Please don't say Yuuji Itadori."
"…Megumi, actually."
Ren groaned. "Even worse."
His first day at Jujutsu High was chaos. It began with a duel.
He wasn't even in uniform yet.
"Ren Takahashi, right?" shouted a girl with a high ponytail and a giant hammer in one hand. "Let's spar! I want to see your technique!"
"Nobara—" Megumi started.
"Fight me, newbie!" she yelled, ignoring him.
Ren raised both hands. "Can I at least finish my breakfast first?"
Nobara lunged.
Technique Activation: Shizukana Ushio.
Ren flicked his wrist. A thin jet of cursed water launched forward—utterly silent, nearly invisible in daylight. It struck the ground next to Nobara's feet, slicing through the tile like a laser.
She stopped mid-charge.
"…Did you just use stealth water on me?"
"Stealth cursed water," Ren corrected. "Big difference."
Nobara grinned.
"I like you."
Megumi sighed.
After the sparring match (which Ren only survived by dodging and using his water like a hose on steroids), he was officially welcomed into Class 1.
Gojo gave him the tour, which mostly involved pointing out locations, flirting with the staff, and randomly disappearing mid-sentence. Ren found out his dorm room was next to Megumi's and across from Yuuji Itadori's—who was still a few days away from his fateful Sukuna encounter.
"Question," Ren said as he unpacked.
"Shoot," Gojo replied from the ceiling.
"…Are you ever going to act like a responsible adult?"
"Nope."
That night, Ren trained alone.
The cursed water sloshed and hissed as he tested its forms: jets, spears, whirlpools. It responded like muscle memory—but it wasn't memory he had. He was learning his new body as much as his new power. But every time he summoned more cursed water, it felt… alive. Not sentient, but primordial. Heavy.
His hand trembled again.
He activated Rivaiazan no Kyū—a swirling barrier of cursed water, spinning with sharp force. He maintained it for twenty seconds before collapsing, breathless.
It took everything he had to control even a sliver of his potential. But he wasn't afraid.
He was excited.
The next morning, Gojo burst into his room.
"Field mission!"
Ren sat up. "What?"
"Grade 2 curse. Rural area. Easy enough. Nobara and Megumi are coming with. You're on observation duty. Try not to die."
Ren groaned. "Why do I feel like this is going to be my villain origin story?"
Gojo winked. "Because you're smart."
The village was silent.
No birds. No breeze. Just rot.
A fog clung to the streets like smoke, thick and wet. Ren's cursed perception buzzed.
"It's hiding," he muttered.
"Probably underground," Megumi added, releasing his Divine Dogs. "Stay alert."
Ren stepped ahead—and stopped.
He saw it.
A shimmer in the air. A ripple in the puddle. And then—
It struck.
The curse burst from the ground like a centipede made of broken glass and limbs. Megumi countered with his shikigami. Nobara flanked it with her nails.
Ren watched.
He could feel its cursed energy. Where it pulsed. Where it was weakest.
He waited.
And then—
Uchi Naru Daikōzui.
A flick of his hand. A droplet of cursed water, so small it looked like mist, flicked into the curse's eye.
Three seconds later, the curse howled—and exploded from within, ripped apart by a pressure bomb that never touched its skin.
Silence.
Ren exhaled. "Internal water expansion. That one's gross."
Nobara stared. "That was awesome."
Megumi raised a brow. "You said you were on observation duty."
Ren shrugged. "I observed. Then I deleted."
That night, back at the dorms, Gojo sent him a single message:
"Looks like the tide's turning."
Ren didn't sleep.
He stared at his glowing cursed water, flowing endlessly from his palm.
Beneath the surface of this new world, something was calling him deeper.
And he planned to drown it first.
---
(It is a fanfic written by an artificial intelligence.)