They summoned a demon to save the world, and offered him a sacrifice in exchange for fulfilling their wish. The problem was that the demon they summoned was the Demon King and if anything bad happened to this sacrifice, he would destroy the world.
They summoned a demon to save the world, and offered him a sacrifice in exchange for fulfilling their wish. The problem was that the demon they summoned was the Demon King and if anything bad happened to this sacrifice, he would destroy the world.