Sugimoto, a junior colleague whom her husband Ke'ai, was transferred to the head office after finishing his work at the branch office and began working with her husband. The two of them invite him over to their house and take care of Sugimoto, who lives alone. One day, unable to suppress his lustful urges, he approaches Yuko and the two end up having a relationship. Yuko, who had been conscious of the lack of sex life after her sister-in-law pointed it out to her, is drawn to Sugimoto's charm, which is different from her husband's, even though she knows it's wrong...