Demon World

It is revealed that the world is indeed split into two instead of Demons having conquered the Human world within the last 30 years.

History
Millenniums ago, before the built of plantations, both demons and humans shared the same world thus leading to frequent hunting of humans by the demons. Some humans soon after did the same, while the rest worship and respect them out of fear of getting eaten. This became a continuous cycle as both sides begrudge each other. After no one could tolerate the destruction, a person from the human side stood up to the demons and made a contract. Hence, once the contract was formed, the world was split between demons and humans.

Ancient Treaty
We shall make a treaty as follows: "Human beings shan't hunt 'demons' anymore. In return, 'demons' shan't hunt humans either. This world we live in shall be divided between both.".undefined A proposal —otherwise known as The Promise— was formed by an unknown person on the human side. It soon led to an agreement between the two races as the proposal was sealed; the humans and demons are restricted from further hunting. Afterwards, the world was broken into two— one side belonging to the demons while the other belonging to the humans. However, despite the purpose of the proposal, humans gave their children to the demons as a parting gift when they fled from the demon world. The children were later kept in "plantations" (institutions that took care of the children) as livestock for the demons to consume.

Trivia

 * The demon world is theoretically divided into 4 areas as per Minerva's pen with Gracefield House as the origin point, they are namely "A", "B", "C", "D".in a clockwise manner.