Chiharu eavesdrops on her son and his best friend Kazuya talking about their virginity. Chiharu, who is on the verge of exploding with her daily frustrations and motherhood at Kazuya's pure adolescent boyishness, who does not yet know the pleasure of sex and is curious about sex, invites Kazuya to her house when her son is away, and asks her to be a ``woman.'' Are you interested in my body? If you don't mind, I can teach you...'' and begins to give sexual guidance.