19 years before the game begins, the world was a peaceful place. Aside from the occasional invasion of a demon, or a raiding party of petty monsters, everyone lived a life of peace and quiet, the weather made calm by the spells of their guardian priestesses, morale kept high by the lighthearted mood throughout the land. However, one day a powerful demon found his way to Earth. His tactics differed greatly from those of his fellow demons. While other demons would've immediately stormed the nearest human village in a killing rage, he instead settled down as an ordinary human, and contented himself to observe. To be sure, he fully intended to unleash his wrath upon Earth, but only when the time was right. However, Earth was saved for a time, as he fell in love with a beautiful human priestess. She discovered his identity, but it did not phase her, as can happen with love (especially enhanced by the power of magic). Eventually, they had a son, and named him Sejan. However, others soon noticed that the boy was different from other children, and the demon and the priestess were forced to flee to a mysterious swamp. The townsfolk confronted them there, and the priestess was forced to use the last of her energy to shield her child from the townspeople. The resulting burst of energy served as a beacon for nearby demons, and soon a vast army was assembled. Led by Sejan's father, they sought to wreak havok on Earth to repay them for the pain they had caused him. As for Sejan, he was transported to a remote town in the mountains, secluded, for the time being at least, from the conflict...