Myriam, an orphan, learns that she is going to change foster families. She is often mocked for her naivety, but this candor allows her to see what others do not: talking animals or even benevolent witches who guard the forest overlooking the city. Only she could believe in the destiny of young Bilal who, he claims, is going to join his parents on the planet Mars. This first summer day will be their last in the land of their childhood.