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.