The game takes place in the seven-planet Valdi System. An evil space pirate, Kaiser Greedy, has made the planets' leaders obey him. The inhabitants of Planet Neer pray for a hero before Greedy's mind control snatches them. The desperate prayers reach the nebula of the Star Goddess, Oruto. She awakens one of her children, Ristar, with the sole purpose of granting the wishes of the innocent people. He must stop Greedy and the brainwashed leaders of each world in the galaxy, to restore peace to the galaxy.