Up in the heavens, eight angel sisters lived much like any sisters do: they argued a lot. One day, a decree came down from on high. One... and only one... of the sisters would be chosen to become an archangel, but it was up to them to decide who it would be. It was decided that each of them would make a pact with a warrior on Earth, through whom they would fight, and the winner of a grand tournament would be chosen to become the new archangel.