A young girl named Saki (played by Matsuhiro Jun) finds out about her mother's secret bondage SM relationship with a man. After losing her mother in an accident six months prior, she has been living with her stepfather, who lost his job due to the shock of the tragedy. Unable to abandon him despite their strained relationship, she decides to take care of him while he struggles financially. However, she discovers that her stepfather has been keeping another secret... one that involves BDSM, rope bondage, candle torture, and sexual training. As her desires clash with her hatred towards him, she slowly succumbs to submission and even experiences multiple orgasms through intense pleasure. This is Saki's first attempt at full-scale SM bondage play, leading to unexpected results! Note: The recorded content may vary depending on the distribution method used.

【末広純 麻縄緊縛SM解禁作！！】私は最初から知っていた。この男（ひと）と母親の秘密を――――。 半年前に母親を事故で亡くし、生前の再婚相手だった義父と2人で暮らす少女 純。義父はその事故のショックで心を病み、職を失ってしまう。そんな義父を放ってはおけず、学校を休学して世話を続ける日々だったが…義父の’秘密を’知っている純は、どうしても義父に心を許せずにいたのだった…。麻縄緊縛、ローソク責め、玩具調教、中出し…母の代わりに向けられる欲望に、少女の憎悪は次第に諦めの境地へと堕ちていく…。 末広純が初の本格SM緊縛挑戦でまさかの失禁しまくり昇天！※ 配信方法によって収録内容が異なる場合があります。