In the wake of her mother's tragic death, French teenager Junie transfers to a different high school. Though Junie lives mostly inside her own head, her beauty and stoicism win her the attention of the entire male student population. Junie begins dating the gentle Otto Cleves, but finds herself intensely drawn to her youthful Italian language teacher, Nemours. When Nemours begins to reciprocate, serious complications ensue.
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".
