Fifteen-year-old Kenza and her thirteen-year-old brother Mahdi regularly act out an escalation of petty cruelties and humiliations inspired by social networks. Today, during a bus ride, Kenza puts her naive and romantic little brother to the test: he must make a declaration of love right now to Jada; a girl Mahdi loves but who doesn't know him. Pressured by his sister, Mahdi finally sets out about it.