The sexual relationship between Minami Hatsukawa and her husband has been diminishing, and she has to always endure the situation of having a husband yet feeling alone. Living with her father-in-law, she must care for him to be a devoted daughter-in-law; she only does housework to forget her own desires.
One day, her father-in-law accidentally discovered Minami's lack of fulfillment. Feeling sympathy for her, he decided to repay the care and attention that his devoted daughter-in-law had given him. With his skilled techniques as an experienced man, he helped her achieve satisfaction that she had never experienced before.