One hundred mamodo (demons) go to Earth every 1,000 years to battle to become the king of the mamodo world (hell). Each mamodo has a particular element which it can control by using different spells. A mamodo needs a human partner in order to use his or her spells, to use the spells the human partner has to read the spells from a spell book, if his or her spell book is burned, the mamodo is forced to return to the mamodo world. « less