Sabine and Cédric's life changes dramatically the day their son, Julien, confesses to them his certainty of being a girl in a boy's body... Sabine and Cédric are faced with an insoluble dilemma: accompanying their child in a transition to female gender? Or continue to try to make him accept his body as it is? While Julien seems more and more fragile, Sabine and Cédric realize that they will not only have to fight for their child, but also for the unity of their family...