Her husband is busy with work and can't come home today either. With their marriage life stagnating, Kozue's (Kozue Tokita) desire has reached its limit. Her daily masturbation routine is becoming more and more extreme with each passing day. Still, she is not satisfied and her desires only grow. Atsushi, her son's friend, notices Kozue's frustration. Atsushi has had feelings for Kozue for some time and thinks that now is his chance to have her. Then, on a weekday afternoon when Kozue is alone, he visits her house...