Yuri has a happy marriage as a teacher, living with her husband, Makoto, her colleague. However, one day, she unexpectedly reunites with Kimura, her former senior teacher, in her neighborhood. He tells her that after she left the school to get married, he became involved in a conflict with parents over a bullying incident, which led to him resigning from his teaching position. Once energetic and cheerful during their time at school, Kimura now appears broken and defeated, and Yuri watches over him with pity and sympathy. But this reunion was no accident—it was part of Kimura's plan. Unaware of his true intentions, Yuri gradually finds herself drawn to him, eventually becoming sexually involved. Yet the real reason behind his actions remains a secret to her.