28-year-old Yayoi has been married for three years and feels worn out by her monotonous daily life. She harbors a secret sexual desire she can't share with her husband, and after an experience during her student years, she realized, "Maybe I'm masochistic." She once felt intense pleasure and excitement when her boyfriend at the time tied her hands and they had sex. Drawing on this, the director combines outdoor humiliation scenes with indoor bondage play to unlock the wife's true sexual nature and offer her new, intense experiences.