The film is based on Jujutsu Kaisen 0 (JUMP COMICS / Shueisha), a prequel manga to the smash-hit supernatural adventure series from Gege Akutami.
"Jujutsu Kaisen 0" key art courtesy of Crunchyroll, cr: ©2021 JUJUTSU KAISEN ZERO The Movie Project ©Gege Akutami Shueisha
As the offficial Synopsis for Jujutsu Kaisen 0 goes:
When they were children, Rika Orimoto[...]