Daemon Realm

The Daemon Realm (悪魔界), also known as Hell (地獄), Underworld (冥界) or the World of Darkness (闇の世界), is a Spiritual World where Daemons come into existence and the Domain of Demonic (魔の領域). It can only be accessed through Hell Gates (地獄門), also known as Underworld Gates (冥界門).