Husband Toshikazu is arrested on suspicion of rape, leaving his wife Mai confused and distraught. Claiming responsibility because their sex life was unsatisfactory, her father-in-law, Naoki, begins "sex counseling" sessions with her. He lustfully gropes Mai's voluptuous body, forcibly makes her suck his cock, and throws her onto the bed. The beautiful daughter-in-law's nightmare of having a physical relationship with her father-in-law spirals deeper and deeper.