Riona, a wife who lives a fulfilling life with her husband, works together with her husband. When her husband goes on a business trip, she takes on the task of caring for her father-in-law on her own, but she is irritated by her father-in-law, who is demented and perverted, and she hits him. Feeling guilty, Riona realizes that her father-in-law meant no harm, and the next day, while caring for him, he becomes aroused and rapes her. Riona resists, but her father-in-law's honest caresses, which satisfy her desires, bring her to climax, and she experiences a pleasure she has not felt in a long time. Riona is attracted to her father-in-law, who is sexually greedy even in his old age...