46-year-old housewife Yumiko Mitsuse. A beautiful woman from Hiroshima, she has a neat short bob hairstyle and a slim waist accentuating her F-cup big tits. Her son is 18, and she's been married for 20 years. She maintains a sexual relationship with her husband about twice a week, but the most intense pleasure she's ever experienced was with her boyfriend before marriage. Back then, she achieved vaginal orgasm accompanied by squirting—an unforgettable climax she's never been able to replicate since. As the years pass, her longing for that peak sensation grows stronger. Now, she desperately seeks the same or even greater pleasure she once had. She is about to step onto a path stained by taboo and infidelity.