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.
In modern day Tokyo, three university students, Negishi Miyako (Neko-chan), Saiki Haruka, and Yamagishi Keiichiro, have magical powers that make them feel like outcasts. They come together one night and are transported to another world. They open a massive door and Neko finds that she is the Princess Neryulla, who must defeat the evil Duran III to free her people.