Jigoku, also known as the Realm of Evil, is one of the Spirit Realms. It is a realm of pure and darkest evil and the source of the oni and the Shadowlands. Though all of the Spirit Realms are occassionally referred to as “Jigoku”, the proper use of the name is only for the one dark Realm.
The realm itself is a maelstrom of pain and suffering, with the yokai spirits being constantly hounded and tortured by oni. The gates of Jigoku are guarded by Yakamo no Oni, who keeps Kitsu Okura’s soul eternally bound to the gates as a reminder of Yakamo’s failure. Jigoku is one of the most jealous realms, exerting its control in the form of the Shadowlands Taint. It is primarily concerned with the corruption of Ningen-do, since it is connected to all other realms.