梨花是东京市内一间高级瑜伽班的学员，本来练习瑜伽应该令性生活更美满，可是梨花的爱侣和彦被扭曲的性欲操纵，往往要以各种各样 SM 形式才可满足，令梨花每日都受尽残暴的折磨，陷于深深的绝望与矛盾当中……瑜伽班的导师麻里子早已留意到她学员梨花的事，她亲自找和彦希望令他理解梨花的感受。这时，麻里子的前夫带同他债主冈野，向麻里子施暴，麻里子的本性突然流露了出来……

The female instructor Mariko gives yoga classes at a high-class club in Tokyo. She has a crush on Rika whom she gives private lessons to. When she notices bruises on Rika's body, Mariko learns that the young woman is involved in a highly abusive S&M relationship. On order to gain the affections of her student, Mariko decides to take revenge against the men in Rika's life.