Aki Sasaki has taken care of Kinoshita, a friend of his son who lost his mother early. Kinoshita has harbored a secret admiration for a beautiful girlfriend. One day, Kinoshita, who happened to see Aki's ripe body, realizes that his admiration has changed to love with sexual desire. Kinoshita greedily seeks Aki's body. On the other hand, Aki gradually began to seek Kinoshita even though he knew that the relationship was forbidden.