Arthur, 15, has a crush on Ouassima, who does not even look at him... While he has never been upset, she goes out with Matt, the handsome kid from college. To get closer to her, Arthur gathers a group of single losers and offers to give them lessons in fishing, at 10 euros per lesson. In the changing rooms of the swimming pool, a long intimate and collective learning begins on "girls and love: instructions for use".