Kingdom Under Fire is set on the continent of Bersia, which is occupied by the following military powers:
- Ecclesia: A religious kingdom on the west coast of Bersia.
- Hironeiden: Another Human Kingdom south of Ecclesia.
- Azilia: A puppet kingdom controlled by Ecclesia.
- Arein: An elvish kingdom within Hironeiden.
- Vellond: The dark elf state ruled by half vampires.
- Hexter: A country full of orc and ogre tribes, commonwealth of Vellond.