Underworld

"Only the w'rthy shalt stayeth in the und'rw'rld, the peaceful flo'r of hell, and those who is't art condemn'd and a sinn'r shalt beest t'rment'd in the hell's below f'r all entinity."

- Amun-Ra

The Underworld (後生, Shigo no sekia), also known as Hades (黄泉, Hadesu) is the first floor of Hell, and is the peaceful floor to which all good souls go to. The Underworld is ruled by three deities (Hades, Amun-Ra & Osiris).

Hades
Hades is to sort out the souls departing to either deeper into the Underworld for everlasting peace, or sent further into the burning Hells to be tormented.

Amun-Ra
Amun-Ra maintains the Underworld in the whole. He's the one who overseers the floor, and also to interact, and help the souls there. He also raises the "sun" in the Underworld, and the "moon".

Osiris
Osiris is the judge of the Underworld, and determines who shall enter the Underworld, or sent to the Hells below.

Territories
Despite being ruled by the three deities, there are also another group called Devils. The devils noble houses maintain law and order alongside Amun-Ra. The most notable houses are the House of Gremory, House of Sitri, and the House of Lucifer.