Got it! I've cleaned up the spelling, grammar, and formatting, while keeping the Webnovel-friendly style intact and the pacing punchy. Here's your Chapter 1 revision:
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Chapter 1 — The Beginning of Chaos
Tokyo — Haru Takahashi
Haru Takahashi woke up after a long trip.
"Why is the city so quiet?" he muttered, glancing around his room. Tokyo should have been alive with the usual noise—traffic, chatter, the faint sirens from downtown. But today… nothing.
A voice suddenly spoke inside his head.
> "Chaos Convergence will begin. Prepare yourself."
The voice vanished as quickly as it appeared.
"Who's there?" Haru asked aloud.
> "Onee-san… is anyone home?" he called, but only silence answered.
Haru walked to the window. The streets below were eerily empty. Even the neon signs that normally flickered and buzzed were dark.
A faint, shimmering light appeared in the sky. A rift, twisting like liquid glass, hovered above the city. Strange symbols floated around it, pulsing with energy.
Haru's pulse quickened.
> "Impossible… what is that?"
Before he could react, a sudden wind rushed through the apartment, scattering papers across the floor. An invisible force tugged at him, pulling him toward the window.
> "Haru Takahashi," the voice returned, calm but commanding. "Your world is no longer safe. Step forward… if you wish to survive.
Haru's body was lifted into the air, and the city around him vanished in an instant.
Jujutsu Kaisen Universe — Yuji Itadori & Gojo Satoru
"Is everything alright, Gojo-sensei?" Yuji asked, noticing his mentor's tense posture.
Gojo's eyes scanned the horizon, sharp and alert.
> "Something's about to happen. I don't like this feeling," he said.
Suddenly, a rift tore open in the sky, shimmering like liquid glass.
A deep, commanding voice echoed from the portal.
> "Your world is not safe. If you wish to survive… step into the portal."
Yuji's eyes widened.
> "Is this Kenjuku's work?" he asked.
Gojo scanned the surroundings. The portal was only visible to Jujutsu sorcerers.
Naruto Universe — Konoha, Hidden Leaf Village
Naruto was teaching Himawari Rasengan in the training field when the air suddenly grew still. Birds froze mid-flight. Even the leaves seemed to hold their breath.
> "Sasuke… do you feel that?" he asked, frowning.
Sasuke lifted his head, sensing the shift in chakra.
> "Something… unnatural is happening. I don't like this," Sasuke said.
Before Naruto could react, a rift opened in the sky above the village, glowing with strange energy unlike any jutsu he had ever seen.
> "Your world is not safe. If you wish to survive… step into the portal."
Naruto's blue eyes narrowed.
> "A portal? Who's trying to mess with Konoha?"
Without waiting, he and Sasuke leapt toward the rift, instincts screaming that this was no ordinary threat.
The same mysterious portal now appeared across three worlds, pulling Haru, Jujutsu sorcerers, and shinobi toward the Chaos Convergence.
One world waits in the shadows.
The Chaos Convergence begins… and they do not know what's coming.