KALE KINGDOM was a new kingdom on the continent.
It hasn't even been twenty years since the kingdom was established. It used to be a part of an empire. But when the empire fell, one man rose and started picking-up what was left of the fallen territory. Apparently, that man was chosen by the Moon God himself to rule a new kingdom.
Thus, Aleo Moonchester became the king of the Kale Kingdom.
He and his group of friends were apparently blessed by the Moon God with powers that made them stand above ordinary humans. That was when the gift called 'Mana' became well-known in the empire. But only the royals and the nobles had that kind of power. For that reason, the nobles only married and reproduced within themselves.
But from time to time, a Mana-user would be born into an ordinary family. But despite that, they would be treated differently from Mana-users with royal or noble blood.