Spirit World

Spirit World (異界; Ikai) is a dimension parallel to human society, from which both the Yōmu and the Spirit World Warriors originate.

Inhabitants
Spirit World is mainly inhabited by Yōmu, supernatural creatures that have the ability to cross into the human world and cause catastrophes by possessing humans, animals etc., and the people who wish to protect both realms from the Yōmu, called Spirit World Warriors. Apart from those, a variety of flora and fauna exists within the Spirit World, most of which is identical to the one from our own world.

SWW Clans
The Spirit World is regulated by the Spirit World Warriors. The governmental system of the SW is oligarchic in nature; powerful families of Spirit World Warriors rule over the dimension. One such family is the Nase clan.