43-year-old housewife Rie Nishina lives in Nakano Ward. On the surface, she appears to have a perfect life with her firefighter husband and two children. However, she's been suffering from a decade-long sexless marriage, causing mounting daily stress. One day, she had a one-time affair with a handsome coach from her child's popular youth soccer club, experiencing new excitement and pleasure for the first time in years. Since then, she's been masturbating daily to relieve her pent-up desires. Today, she's come once again to release all that built-up sexual tension.