Yoko is a divorced mother who is raising her beloved daughter Rena on her own. One day, after returning home from shopping, she hears suspicious moaning coming from her daughter's room. She plans to lecture her daughter on being indecent in the middle of the day, but it turns out to be her sex friend Kyojiro. Yoko panics, but when she finds out that he has been making advances not only to her but also to her daughter, she begins to toy with him, asking, "Maybe I'm not enough for you?" with a seductive smile. Kyojiro is confused by this sudden turn of events, but makes up his mind, saying, "It's shameful for a man to not eat the food that's set out for him"...