Yuri is a married teacher working at the same school as her husband. Strict but caring, she is admired by most students, except the rebellious Yano in this adult school role-play. When she catches him cheating on a test, she exposes him in front of the class, argues with him, and finally slaps him. Humiliated and furious, Yano begins plotting revenge, using a female classmate to lure Yuri into a trap that threatens her marriage.