Rieko, a married female teacher, is transferred to a school where her husband previously worked, beginning a new chapter in her career. However, she soon learns from her colleague Kyomoto about her husband's past affair with the mother of one of his students—an affair so severe it led to him being removed from his homeroom duties. As Rieko navigates the challenges of her new workplace and grapples with her husband's betrayal, she becomes entangled in a web of humiliation, coercion, and lesbian encounters orchestrated by those who exploit her vulnerability. Caught between duty and desire, Rieko faces impossible choices that threaten to unravel her life.