Mikado and Laetitia home-school Nuage and Zephir while living in a van. The van breaks down, so the family must spend the summer in a house. The change challenges their alternative lifestyle.

During a heat wave, strange clouds start pouring down acid rain, wreaking devastation and panic throughout France. In a world teetering on the edge, a girl and her divorced parents must join forces to confront and try to escape this climate catastrophe.