Emma was born female. As a teenager, she wanted to transition, i.e., change her gender. At age 14, with her parents' support, she was admitted to a hospital unit specializing in transgender care. At age 15, she began hormone treatment. On the eve of her 17th birthday, she underwent a double mastectomy. Now 20, Emma is returning to her birth gender by forging her own path. At a time when countries that are pioneers in gender transition for minors are changing their care policies, this film attempts to shed a nuanced light on the subject.