Mariko, a yoga instructor, develops feelings for her student Rika. Noticing bruises, she learns Rika is in an abusive relationship. To win Rika's affection, Mariko takes revenge on the men mistreating her.

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.—Anonymous