Kleber is seventeen, his older brother Umnik is twenty-two, but the mind of a three-year-old child lives in him. In early childhood, due to a genetic illness, he stopped developing. After their mother’s death, their father sends Umnik to an orphanage, from which Kleber brings him back, and the brothers move to Paris. There they rent a room in an apartment where already live four other students. And that’s where the most interesting part begins.