Sir Domingo, Spanish Knight and Holy Crusader, is blessed with a vision on his return from his triumphant conquest in the Holy Land. The Holy Grail appears in the sky, leading him on an adventure to another realm where demons and monstrosities lay waste to all of creation. He discovers a strange race of people called the Kityin, who seem more kin to Earth's cats than they do humanity. He alone can lead them to salvation and away from the tyrannical rule of The Demon King. Should he fail, not only the Kityin but all the people of all the realms will be destroyed!