Ai Minano, whose father was a renowned wrestler, has trained in self-defense since childhood. When her father falls seriously ill, she inherits his dojo. To keep it running, Ai trains daily with coach Kawase. However, Kawase, who has long harbored feelings for her, begins acting increasingly familiar in her father's absence. One day, after Ai suddenly collapses during a lesson, Kawase calls her out, using practical self-defense training as a pretext to assault her. The dojo passed down from her father becomes, unexpectedly, the scene of a rape.