Rie Nishina, 43, is a full-time housewife living in Nakano Ward. Surrounded by her husband, a firefighter, and her two children, Rie seems to have been living a smooth sailing life. However, it seems that her sex life at night is not going well... One day, almost 10 years after going sexless with her husband, she had a one-time affair with a handsome coach at a youth soccer club who was popular with the other housewives... She has never been able to forget the excitement and pleasure she felt, and now she masturbates almost every day to satisfy herself. Today, she came to relieve her pent-up sexual desire.