Miki, a wife, has been left alone with her son for a long time due to her husband's work assignment. She has always had a stronger sexual desire than most people, so she releases it by masturbating and holds herself back. However, her son Junpei is seduced by her sensuality that seeps out from her after the suppression, and he is unable to resist pushing her down beyond the mother-son relationship. Since then, Miki has been spending her days in secret, but her brother-in-law Tatsuyoshi finds out. Enraged, Tatsuyoshi declares, "I'll punish you!" and begins shaving the pubic hair that has grown between Miki's legs.