Oliver, a young film director, discovers on a porn Web site one night that the protagonist of one of the erotic videos is his younger half-sister Aurora. In the process of finding out what she was doing there, Oliver will become fascinated by his sister.

'Chicas Paranoicas' is the first Spanish comedy about the world of fashion in a fictional work, though with dramatic elements. It tells the story of three girls (Ana, Paula and Veronica) who enter it by chance, seeing a way to earn a little easy money, and soon become fascinated.