In an age of medieval fantasy populated by fantastic creatures, the Green Wizard Carolinus, who presides over nature, notices that magic is fading from the world as humanity embraces logic and science instead. Summoning his three magical brothers, he proposes combining their powers to create a "last realm of magic" hidden from the rest of the world. The Blue Wizard Solarius, who commands the heavens and seas, and the Yellow Wizard Lo Tae Zhao, whose realm is light and air, agree to the proposal. However, the Red Wizard Ommadon, master of black magic and the forces of evil, resolves instead to infect mankind with fear and greed, causing humans to use their science to destroy themselves.