Satomi, frustrated by the lack of sex life due to living with her husband's father (father-in-law), has an affair with her boss at her part-time job. When her father-in-law finds out, he gets angry and demands sex. Satomi refuses, but she gives in to his forceful caresses and ends up getting creampied. Since that day, her father-in-law, who has an insatiable sexual desire, does whatever he wants to his wife Satomi, who has big breasts and a voluptuous body, wherever he sees her.