Children's Day, in the area you can hear laughter and singing of children playing, but the protagonist of the film due to illness can not take part in these games. He reaches for his telescope and begins to observe the sky, on which he sees... an incoming space vehicle. The ship stops over his house, and the crew invites the boy inside. His aunt opposes this, but she is also invited on board. This is how the adventure begins, during which children from all over the world will meet to admire the stars and planets.