After her daughter Makio's marriage and the end of child-rearing, mother Ai was about to start enjoying her own life when she was asked to mediate a marital dispute. Unable to grasp the situation from Makio's explanation, Ai decided to hear it from her son-in-law Shinichi... Only to find out that Shinichi had been harboring feelings for his mother-in-law Ai. Unable to contain his emotions, Shinichi pushes Ai down, but she stops him. However, Ai unconsciously moves her hand towards his crotch as she feels a stirring in her body from the touch of a man's skin after so long.
