Aki Sasaki has been looking after her son's friend Kinoshita, who lost his mother at an early age. Kinoshita has secretly harbored a desire for her beauty. One day, by chance, Kinoshita sees Aki's ripe body and realizes that his admiration has turned into love coupled with sexual desire. Kinoshita greedily desires Aki's body. Meanwhile, Aki, despite knowing that their relationship is forbidden, gradually begins to desire Kinoshita as well...