52-year-old Ippei moves back to his old apartment after 25 years. He had lived with her there before, but left her, Nane, and went to Tokyo to pursue his dream of becoming an actor, only to fail and return. However, fatefully, the neighbor is a girl who looks exactly like Nane, Nenne. A 27-year age gap, two people with a difference of parent-child age, it was inevitable that they would be attracted to each other. Ippei is tormented by a feeling of guilt while reminiscing about the past, and he starts a physical relationship with her... At the same time, Ippei realizes that she is his daughter.