Galileo lives alone on an isolated flying island, in a small house fully equipped for observing the sky. Obsessed with the idea of climbing ever higher, he builds a steam engine. His machine actually makes him take off very quickly and very high, but for a very short time... He crashes heavily on a new island where he meets a pretty little girl with the butterflies: Cassiopeia. Alone too, she will help him, somewhat in spite of herself, to create a new kind of flying machine, combining their two skills...
