Chiharu overheard her son and her best friend Kazuya excitedly talking about being a virgin. Chiharu, whose everyday frustration and maternal instincts are about to explode at Kazuya's pure teenage boyishness, who doesn't yet know the pleasure of sex and is very interested in sex, invites Kazuya, who came while her son was away, into the house and says, "Are you interested in a woman's body? If you like, I'll teach you..." and begins sexual guidance...
