Hell

An alternate world that can be accessed by the Mirror Gate located in the Vatican. It is inhabited by former humans of that world that have changed into lifeforms without flesh and consisting of only souls due to the environment having been decimated long ago. The 'Humans' of this world have either migrated to Earth and interbred with the Humans of Earth or they stayed behind and became the entities known as 'Demons' in Earth mythology and religions. There are 9 stratums where these 'Demons' live and the lower levels are ruled by Seven Kings, each with a level of power and presence comparable to Ehito as noted by Yue.