Minori is a married woman who has been living with her husband's family for four years. She has built a good relationship with her father-in-law, but she doesn't mind living with him, even though everyone else dislikes him. Although Minori lives a happy life, the only thing she is dissatisfied with is the marriage rule of having a baby on ovulation day. They only have short sex sessions, where she receives her husband's indifferent sperm. After they finish sex that day, she heads to take a shower and runs into her father-in-law. He notices Minori's sexual frustration, and unable to suppress the sexual desire he has been holding back, he pushes her down...