Known for her work as a screenwriter (The Bélier Family, Naked Normandy), Victoria Bedos makes her directorial debut with a touching film about the challenges of adolescence and questions of identity. The story follows the footsteps of Marie-Luce, 14 years old. The costume party at her new school is approaching, but she hasn't been invited. Nevertheless, she decides to attend, dressed as a boy... a boy who garners a lot of attention and admiration. The young girl invents a male alter ego, named Léo, to finally live her teenage life and experience her first love.