My son, Yuichi, is caught shoplifting by his classmate, Hayato. Hayato is told by Ayaka, Yuuichi's mother, that he will not make it public on the condition that he will play with her. Ayaka puts up with it for her son's sake, but her body, which has climaxed many times against her own will, gradually begins to accept his training. Before long, it becomes uncontrollable and nasty.