"O" is a free and independent woman who is taken by her lover René to a castle in Roissy, near Paris, where she becomes a slave to René and other men. In the castle, "O" is branded with her master's initials and subjected, of her own free will and consent, to a variety of sadomasochistic sexual practices.
The "Torture Club" is an official after-school activity at the Saint Honesty Gakuen private school. Yuzuki has no idea about the club when she enrolls and is kidnapped by club members and taken to the club room. There, she discovers that upper-class student Aoi, her secret idol, is part of the club and decides to join, but...
The beautiful Shizuko (Aya Sugimoto) and her husband Tooyama Takayoshi (Jo Shishido) have a loving relationship, but Takayoshi is getting older and can't always perform. His main source of gratification is watching his wife in sadomasochistic scenarios, so he hires a painter, skilled in the arts of bondage, to bring these fantasies to life. Soon, Shiziko becomes a submissive participant willing to fulfill the sadomasochistic fantasies not only of her husband, but of a series of rich and lustful men.
Badly injured and dumped in an alley, Joe (Charlotte Gainsbourg) is found by an older man, Seligman (Stellan Skarsgard), who offers her help. He takes her home, where she can rest and recover. When he wakes up, Joe begins to tell Seligman details about his life. Assuming that she is a nymphomaniac and that she is by no means a good person, she recounts some of the sexual adventures she has experienced in order to justify her self-assessment.
