This story takes place on an alternative Earth, in the USA.
As a child, Elise always admired her dad for being at the top of the underworld. She wanted to be just like him. However, it soon changed when different species came to Earth and attempted to take over the underworld, resulting in the death of her family. As she was at the door of death, a mysterious man named "Entity Six" saved her and promised to take her to the top of the underworld as a godfather.