Hiro is a young man living under the care of Yayoi, who agrees to initiate him into adulthood through a one-night sexual encounter. However, Yayoi leads a double life, trapped in a cycle of submission and pleasure with a man named Hebizuka, whom she claims to despise. Torn between her love for Hiro and her physical addiction to Hebizuka's dominance, Yayoi struggles with the crushing guilt of her secret betrayal.
To protect her step-brother Hiro, Nijihara Yayoi submits herself to the manipulative Hebizuka Jouji. Hebizuka systematically breaks her will through pleasure and humiliation, eventually forcing her to betray Hiro before disappearing. Left pregnant and broken, Yayoi must now live with the consequences of her sacrifice and seek atonement.