To gain the power he needs to save his friend from a cursed spirit, Yuji Itadori swallows a piece of a demon, only to find himself caught in the midst of a horrific war of the supernatural!

While investigating a strange set of mysterious deaths, Itadori meets Junpei, a troubled kid who is often bullied at school. However, Junpei is also befriended by the culprit behind the bloody incident—Mahito, a mischievous cursed spirit! Mahito sets in motion a devious plan involving Junpei, hoping to ensnare Itadori as well.

While investigating a strange set of mysterious deaths, Itadori meets Junpei, a troubled kid who is often bullied at school. However, Junpei is also befriended by the culprit behind the bloody incident—Mahito, a mischievous cursed spirit! Mahito sets in motion a devious plan involving Junpei, hoping to ensnare Itadori as well.