Saki and her teacher, Takeshi, maintain a professional facade at school while sharing a secret romantic life at home. When Saki discovers Takeshi's hidden interest in S&M, she reluctantly agrees to experiment with bondage, only to discover a surprising masochistic streak within herself. Now embracing her new desires, Saki demands that Takeshi bind and discipline her, transforming their secret relationship into a thrilling game of power and pleasure.