Liza meets the artist Giorgio and falls in love with him. She dreams of becoming the wife of Giorgio, but he is married. She dreams of being a close friend to him, but he has a favorite dog. Liza is ready for any sacrifice for the sake of her love. She kills Giorgio's dog and takes her place. Now she is a woman who always and everywhere follows her master.

Beautiful young housewife Séverine Serizy cannot reconcile her masochistic fantasies with her everyday life alongside dutiful husband Pierre. When her lovestruck friend Henri mentions a secretive high-class brothel run by Madame Anais, Séverine begins to work there during the day under the name Belle de Jour. But when one of her clients grows possessive, she must try to go back to her normal life.