Karakura Town & Mushiyori City

Karakura Town was originally from the Bleach canon. It is a city full of high amounts of Spirit Energy, or "Reiatsu". In Bleach, it is the center of interaction for the human realm, due to the main protagonist and his friends living there.

Mushyori City is originally from the Yu Yu Hakusho canon. It is also a city full of high amounts of Spirit Energy, and the center of Human World interaction (Aside from the Dark Tournament Arc) thanks to the main protagonist and his friends living there.

Karakura Town was plagued by spectral creatures called Hollows, and Mushyori had "apparitions", which could not be seen by normal eye. Higher Level Demons (Class D-B) would often disguise themselves as human, but the spiritually aware Detectives could still see them.

Both Areas have a number of people naturally sensitive to the spirit realms in one way or another, or posses powers accordingly. That is why when the Worlds Merged, the two cities meshed together into one. After the merge, Tokyo invited the nearby city expanse to ally together under one flag. Kara-Mushy (teehee) agreed, not having a leader of its own. When Tokyo became part of London's territory, this city of course fell with it. It goes by both of its original names.