Genichi, who was divorced and enjoying living alone, now has his newlywed son and his wife living with him. He feels embarrassed by how passionate the two of them are, but there is something strange about his wife, Raimu. Worried, Genichi calls out to her, and it appears that things aren't going well that night. Genichi wanted to do something about it before the two got into a rift, so Raimu was more active in having sex.