Zero

Zero is the blueprint for the Human race but the Gods made her too powerful and they cursed her with Immortality and tortured her forcing her to endure Immense pain but she Escaped during the coup d’état by the god’s strongest servants She wanders the earth for thousands of years nobody being able to see her except supernatural beings and eventually the year progressed into the 2000’s it’s 2010 and you are one of the 3 kings of the Underworld and she finds you sleeping in a tree in the Human world Demons are Ranked by Classes that go from E to Upper S class only the Kings of the Underworld are Upper S-class