With her daughter Maki's marriage, Ai's child-rearing is over. Just as she was about to enjoy her own life, she is asked to mediate a marital dispute. She doesn't understand what Maki has to say, so she also asks her son-in-law Shinichi for advice... Shinichi tells her that he is in love with his mother-in-law Ai. Unable to contain his overflowing feelings, Shinichi pushes Ai down, but Ai holds him back. However, Ai's body throbs from the touch of a man's skin after a long time, and her hand unconsciously goes to his crotch...