Yumetaro is a small green creature who ends up given as a birthday present to a young girl, quickly becoming her favorite toy. Jealous that they are no longer loved, her other toys come alive one night and spirit the girl away into another dimension. Left behind, Yumetaro sets off after them, using the star he conjures above his head to strike down foes and to reach faraway ledges as he searches through strange, hostile worlds to bring his owner safely home.