Dilhade (ディルヘイド, Diruheido) is the Demon nation and the primary setting of the events.
With the support from the demons, the Hero Kanon created a fictitious Demon King of Tyranny and the myth that he would be reincarnated into the royal family. Over time, this was misinterpreted and society began to put blood and lineage above all else, turning the royals into a privileged class.
As a result, the current Dilhade is divided into two factions: the royal faction, which puts pureblood demons over mixed-blood demons; and the unification faction, which advocates equal rights for all demons regardless of parentage. The only reason why the unification faction hasn't been eliminated by the royal faction is because they count with the support of one of the Seven Elder Demon Emperors, Melheis Boran.
Seven Elder Demon Emperors
Among demons, those who inherit the blood of the Demon King of Tyranny are called the Demon King clan (魔王族, Maō-zoku). Within this group, those who marry other members from the clan, and have protected the purity of the Demon King's blood are called "royalty".  But regardless of whether or not they are pureblood, anyone from the Demon King clan can attend the Demon King Academy, and only they can attend.
The academy exists to find the candidate most like the Demon King and train them to become future Demon Lords (魔皇, Maō), royal demons who govern different areas of Dilhade. One must also have achievements in order to become a Demon Lord. Only royal demons can attain this position because the royal faction holds most of the power in Dilhade, and the mixed-bloods have no say in how the country is run. However, even with this power disparity, the mixed-bloods live very comfortably and Dilhade is ruled well.
- This country does not allow destitution.
- This country does not allow malice.
- This country does not allow tragedy.
When these rules are violated, no matter what the opponent is, the Demon King of Tyranny will fight for life and destroys them.
- Midhaze City
- Zehenburg City
- Richards Meadow