Spain, 1982. Marisa decides to take her daughter to Madrid to find a solution for an unwanted pregnancy. Lucia ends up in Peñagrande, a reformatory for pregnant teenagers. There, she will forge strong friendships with the other girls and discover the awful truth that her still unborn child is to be taken away from her.

Lucía is an eight-year-old girl, who sometimes struggles as the world tries to catch up with the fact that she is trans. As the summer holidays pass, she explores her femininity alongside the women of her family who at the same time reflect on their own femininity.