Emma was born a girl. As an adolescent, she wanted to transition, i.e. change her gender. At the age of 14, with her parents' support, she was admitted to a hospital unit dedicated to trans-identity. At 15, she began hormone treatment. On the eve of her 17th birthday, she underwent a double mastectomy. Today, at 20, Emma returns to the gender she was born with, inventing her own path. At a time when countries pioneering gender transition for minors are changing their policies, this film attempts to shed a nuanced light on the subject.