Summer in a new suburb outside Paris. Nothing to do but look at the ceiling. Marie, Anne and Floriane are 15. Their paths cross in the corridors at the local swimming pool, where love and desire make a sudden, dramatic appearance. Three girls, each about 15, deal with puberty, the onset of sexual attraction, and, for two, the pressure of virginity. Marie, who's slight and diffident, quiet and nearly expressionless, is friends with Anne, who's a bit chunky and impulsive and has decided that François will be her first love. Watching synchronized swimming, Marie is suddenly attracted to the team captain, Floriane, beautiful, aloof, tall, and rumored to be a slut. François pursues her. Marie begins to hang around her; they trade favors, and soon it's an odd sort of friendship. Each of the three experiences her own first, and Marie must sort out attraction and friendship.