Read Jujutsu Kaisen - Chapter-0-3

Summary of Chapter 0.3 - Punishment for the Weak - (弱者の罰弱者のはじめてのばあい)

Suguru Geto, the worst and most dangerous curse user in all of Japan sets on destroying Tokyo Jujutsu High. In order to ensure a world with only sorcerers. Suguru invokes the Night Parade of a Hundred Demons, summoning thousands of curses in both Kyoto and Shinjuku. While the jujutsu sorcerers deal with that threat, Suguru invades the school alone in order to kill Yuta Okkotsu and capture Rika.