Professor Ayaka, the daughter of the school chairman and a karate instructor, finds her life spiraling after a violent encounter with a delinquent student named Togawa. After seriously injuring him during a struggle, Ayaka is blackmailed into a submissive relationship to protect her reputation and the academy's standing. However, the situation worsens when Togawa's family discovers the truth, leaving Ayaka trapped in a cycle of exploitation and revenge.