After being away for years, Gaspard, 25, is reunited with his family after the announcement of his father's marriage. Accompanied by Laura, an extravagant girl, who accepts to pretend to be his girlfriend during their marriage, he feels ready to set foot again, in the family zoo and see the animals that saw him grow up... But between a womanizing father, an overly sensible brother and a beautiful sister, he is unaware that he is about to experience the last days of his childhood.