Realm Of Spirits [Inverse Soul Society]

The Realm Of Spirits is one that is not quite like the Soul Society. This is because it is ran by many small governments, factions and agencies that help work alongside demons, Arrancar, Iramasha, hollow and other races to maintain the balance of order, disorder, life and death throughout the Inverse Realm. So: one can infer they have no Soul King or Gotei to dictate how the entire realm functions. Additionally, the Realm Of Spirits resembles a modernized Earth in some portions of it because they are a more evolved society of people. And this is because they have to accommodate a dense population of spirits; there are roughly tens of billions that call this place home.

For more information, go here:
https://www.platinumhearts.net/t16526-summarized-information-on-the-known-realms-of-the-black-world