Serge (Serge Gainsbourg) 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 (Jane Birkin). This sexy satire formed the background for one of the swinging sixties most famous real-life romances.
During the rehearsals for Pierre Grimblat's film "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" that became a huge success and set the 70s on fire. Together, they lived one of the most beautiful love stories ever.