A 17-year-old student decides to have her breasts removed and transition to a male identity. Her mother, Ana, resists, convinced that only biological sex exists. But faced with her child’s insistence, she is forced to confront the roots of her fear. After an emotional journey through motherhood, documented in home videos, Ana comes to support her child’s upcoming surgery, who, in honor of the zodiac sign of their parents, chooses the name Leo.