Hell

Hell is a world that exists in one of the nine alternate realities. It can be accessed by the "Mirror Gate" sacred vessel 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 its populace, 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, each with a level of power and presence comparable to Ehit, as noted by Yue. It is one of Nine Worlds with a branch of the World Tree, which Hajime has named "Demon Tree" after he discovered the truth of the multiverse.