Mami Koike had always been curious about bondage, but despite her former lover confessing he was into BDSM, she had never experienced it herself—believing it to be something forbidden. However, persuaded by him, she allowed herself to be taken to a secret room. As he gently held her trembling body and placed a blindfold over her eyes, her long-held beliefs began to crumble. What awaited her was a new, deeply stirring experience that would shake her very soul.