The Kingdom of Belzerg (ベルゼルグ王国) is the country that most of the events take place in.
As the Kingdom of Belzerg is the only country whose borders overlap those of the Demon King's Territory, their border is heavily protected. In order to help them, surrounding countries send soldiers to join the border guard. The only exception being Elroad, which assist with defense costs.
The Belzerg royal family consists of the king, the first prince, and Iris.
- Belzerg was unnamed until volume 10.