Jujutsu Kaisen is a Japanese manga series written and illustrated by Gege Akutami. It has been serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump since march 2018. Cursed energy leaks from the human body, accumulates, and ferments over time until a cursed spirit manifests. This is only the case with non-sorcerers, as sorcerers are trained to control and channel their cursed energy into jujutsu. Cursed energy is the primary power source for any sorcerer or cursed spirit.