On the day of the World Cup final between Brazil and France, Erika Oguihara, a Japanese-Brazilian teenager who rejects her family's traditions, experiences a violence that seems invisible and plunges into a painful sea of emotions.

One day, without knowing how or why, the birds of a big city leave, disappear. It is believed to be a protest against environmental pollution. Some children (the Regaliz group), then embark on an ecological campaign to get the birds to return to the city.