Ririko is a married teacher working at the same school as her husband. In this adult school role-play, both are popular with their students, but bullying has become a problem in Ririko's class. One afternoon, her husband catches adult student Kazuki bullying Shunsuke and intervenes, accidentally injuring Kazuki's hand. The next day, Ririko calls both students in, only for Kazuki to use the injury as leverage: if she does not want him reporting her husband and costing him his job, she must show him her breasts. His blackmail becomes the beginning of her husband's ultimate betrayal and humiliation.