Hoshi no Yuuenchi

A young boy named Takeshi steals an origami crane from his friend Nobu. To Takeshi's surprise the crane begins talking to him and offers to take him and his friends to an amusement park in space where children from many planets play. While riding an attraction designed to test the children's courage, Akiko is sucked into a black hole, leaving Takeshi and his friends to save her.