Mahiro, a full-time housewife, has recently started living with her husband's father, but is worried because they don't get along. Although the kind husband is the one who invited his wife to live with him, he is reluctant to acknowledge his dissatisfaction when it comes to his own father. As her dissatisfaction grows, her father-in-law's sexual harassment escalates and finally crosses the line. She becomes addicted to sex with her father-in-law, even though she was supposed to hate him.