The Expanse

The Expanse, also referred to as Makai (魔界, Makai)? or (魔階, Makai)?, is the world/dimension where demons, spirits and other types of supernatural entities reside. The most accepted translation of Makai means Demon World, and it is sometimes referred to as such.
An otherworldly plane which can not be reached by conventional means, and where the majority of demons live in relative peace under the watchful zeal of the demon king Lucifer.
It isn't so much different from the human world as one would initially think. Instead of just chaotic anarchy, traces of rational civilization can be clearly identified, such as the presence of multiple stores offering various types of services, such as buying and selling weapons, armors, bars, casinos and even a disco where demons actually dance around and have fun.

Travel between universes through the Expanse is possible, as seen from the Spacemen that first arrived in Tokyo.

Areas in the Expanse

Tiphereth
The most populous area of Makai. Seth's temple can also be found here, where the demon rests in a deep sleep, waiting for the right time to awaken. According to a resident of this district, "Tiphereth" is a word that means "beautiful."

Yesod
More or less the entrance to Makai. The entrance changes for those that enter for the first time.

Hod
Not much about Hod is known, since no residents appear in the main town. It is quite small, possibly the smallest area of Makai, and is surrounded by various cliffs. The demon Tiamat is its governess.

Chesed
A Buddhist temple where lost souls who are looking for salvation gather together. The demon Virocana (also known as "Dainichi-Nyorai") is in charge of this area, and is renowned for his ability to purify and grant peace to the spirits who reach Chesed, without any conditions or requirements limiting his judgement of mind.

Geburah
A town that was transformed into a massive iron fortress bristling with weapons, often the first line of defence against further into the Expanse.

Binah
The only known sea that crosses Makai. It is a vast body of water that is also called "the Sea of Harvest" by the residents of a nearby town, a reference to the powers of this ocean to give life to demons when attended by someone capable of preserving its fertility. In the past, this role was the responsibility of the goddess Ishtar, before she was punished by God and stripped of her form and sanity.

Chokmah
A tower that serves as the only accessible path to the Kether area. The Tower of Chokmah is governed by Lucifuge, who acts as the guard for Lucifer's Palace.

Kether
The final area of Makai, it is here where Palace Morningstar is located, which is the home of Lucifer and his compatriots.