Serge is a hip and successful film director who leaves his pregnant wife to attend the annual advertising awards festival in Venice, and enters into a passionate affair with a young British woman. This sexy satire formed the background for one of the swinging sixties' most famous real-life romances. During the rehearsals for Pierre Grimblat's "Slogan", Serge Gainsbourg met the woman who would forever change his professional and personal life: Jane Birkin. They sang together for the first time on the film's theme-song, "The Slogan Song". After which, they recorded their version of "Je t'aime moi non plus". The song became a huge success and set the 70's on fire. Together, they lived out one of the most beautiful love stories.