Former Hell (旧地獄 kyuu-jigoku) is a region in the Underworld that was inhabited by many souls long ago. Many oni also worked there. Eventually, because of overpopulation, the Yamas decided to move Hell to another place, so everyone moved out; thus the place became known as Former Hell. Many evil spirits linger here, left over from before the move. Other oni that had been living above-ground then moved into Former Hell.