Trapped in a monotonous daily routine, 46-year-old Satoko Furuya is overwhelmed by boredom. A mother of two, she’s been married for 22 years. Though her relationship with her husband is harmonious, their sex life has all but disappeared. He’s five years older, and since entering his late forties, their intimacy has steadily declined—to the point where they now have sex less than once a month. Reaching her limit, she’s developed a strong desire to cheat. The longing to find a lover who can bring her sexual pleasure has taken root, and today, as a trial run, she’ll fully surrender herself to the stimulation and ecstasy of an unfamiliar man’s cock.