Hoshi no Yuuenchi

A kindly teacher demonstrates origami to his elementary class, but when he gives a paper crane to a child, it is stolen from him by Takeshi, the class bully. Takeshi discovers that the crane is really a talking spaceship that takes him and his friends to visit a fairground in the stars. A girl falls through a hole into Space Hell, and the children cooperate to rescue her. Takeshi wakes up, wonder...