Hierarchical City

A Hierarchical City (階層都市, Kaisō Toshi) is a term used to describe cities that were built after the Dark War which left a large amount of hazardous seithr that covered the world. After the Dark War, a lot of humans and animals became tainted with the seithr and died off, save for the Kaka Clan. Humans were forced to move to high-altitude areas and create cities there.

List of Hierachical Cities

 * The 1st Hierarchical City of Ōkoto
 * The 2nd Hierarchical City of Iwatsuchi
 * The 3rd Hierarchical City of Naobi
 * The 4th Hierarchical City of Iwasu

The Ikaruga Federation

 * The 5th Hierarchical City of Ibukido
 * The 6th Hierarchical City of Yabiko
 * The 7th Hierarchical City of Kazamotsu
 * The 8th Hierarchical City of Wadatsumi
 * The 9th Hierarchical City of Akitsu
 * The 10th Hierarchical City of Akitsu (?)

The Izumo Region

 * The 11th Hierarchical City of Shinatsu
 * The 12th Hierarchical City of Kukunochi
 * The 13th Hierarchical City of Kagutsuchi
 * The 14th Hierarchical City of Nozuchi
 * The 15th Hierarchical City of Torifune


 * The 16th Hierarchical City of Ōgetsu
 * The 17th Hierarchical City of Yamatsumi
 * The 18th Hierarchical City of Kanayama
 * The 19th Hierarchical City of Kanayama
 * The 20th Hierarchical City of Haniyatsu
 * The 21st Hierarchical City of Haniyatsu
 * The 22nd Hierarchical City of Mizuha
 * The 23rd Hierarchical City of Wakumusubi