Yosumi

The Yosumi (四隅 Yosumi) is an immensely powerful and influential organization that is, in essence, the Underworld's government. It is headed by the Four Great Satans (四大魔王 Yondai Maō), who answer to the Demon God (鬼神 Kishin). The Yosumi has existed for hundreds of years and stands at the top of political power in Hell and.

Overview
The affairs of the human world are left exclusively to the affiliates and branches of the yosumi, they themselves deal with very little. Using their influence and underlings, the Yosumi maintain an international order that is claimed to benefit all, making the world safe for the sake of everyone. Their influence in the human world is currently limited to the southern continent, Cotharas, but this is slowly changing.

Within their sphere of influence, the Yosumi reserve the full right to halt or encourage any political action without question or opposition if they so desire.

However the meeting of the Warlords and other such gatherings will be held at various locations all around Earthland.

Nine Circles of Hell
The Nine Circles of Hell are.

Grigori
The Grigori (グリゴリ Gurigori) is.

Ancyra
The Yosumi are the de-facto secret rulers of the Ancyran Empire, a large country with highly developed and advanced military power. Ancyra functions as the for the demon's of hell to secretly gain influence in the human world.

Ten Shogun
This group is comprised of highly influential and powerful individuals from all around the world. An example of the status and power that these individuals wield; Raphael Gremory is a powerful Devil Slayer that is strong enough to defeat Wizard saint-calibre Mages without much difficulty, the Guild Master of the notorious Dark Guild Torched Heaven and the ruler of an entire nation.

Trivia

 * "Yosumi" literally translates to "Four Corners" in English and mirrors the real life location of the same name that is a region of the United States where the boundaries of four states meet. This is symbolised as the meeting point of the entire world and is a reference to the Yosumi's status as rulers of the world.