Mitsuha is a demure and serious married woman, beautiful with a slender figure and a gentle, charming personality. However, her body is surprisingly sensitive, with a strong libido that constantly reveals her deeply erotic side. On a whim, she tries a dating app and meets a well-endowed, highly virile man. Drawn in by the allure of his massive cock, she becomes increasingly obsessed. Her body responds in perverted ways, climaxing so intensely that her eyes roll back. In a shared hotel room, they repeatedly engage in messy, intense sex. Despite being on her ovulation day, she shamelessly begs him to impregnate her. No longer satisfied with ordinary sex, she spirals into ever more extreme desires.