With her daughter Maki's marriage, Ai's child-rearing responsibilities have finally come to an end. Just as she was about to enjoy her own life, she is asked to mediate a marital dispute. Unable to get a clear answer from Maki, Ai decides to speak with her son-in-law, Shinichi... and discovers that Shinichi has been infatuated with his mother-in-law, Ai. Unable to contain his overwhelming feelings, Shinichi tries to push her down, but Ai resists. However, the touch of a man's skin after so long makes Ai's body ache, and her hand unconsciously moves towards his groin...