When Yuri, a nurse, comes home after a night shift, she feels extremely tired and has a habit of having sex with the man next door. Seeing her like this, her father-in-law is inspired and asks an elderly friend of his to carry out a clever plan. The elderly friend comes to his house to visit and falls ill, so he makes his daughter-in-law take care of him and sexually harasses her. He tells his daughter-in-law that the rice is hard and makes her chew it and feed it to him by mouth, then tells her to accompany him to the bath and shows her his friend's naked body. However, instead of flinching, the daughter-in-law becomes even more lustful and passionately desires the two old men's bodies!