One day at school, Keima becomes the target of a group of delinquents, which is when an imposing girl by the name of Kusunoki Kasuga appears. She dispatches of the delinquents and saves Keima, but she appears to be disgusted by the "weak" Keima and his inability to fight back... After a harsh lecture from Kusunoki, Keima wants nothing to do with her, but once the loose soul sensor goes off, he can no longer ignore her. He attempts to approach Kusunoki by joining the girls' karate club where she is captain...