This world was not like this originally. It used to be vast, rich, and boundless, until a skill called "magic" spread into the world, destroying all the orders established in the name of "technology" with overwhelming force. Everything changed. This used to be the paradise of mankind, but now the survivors prefer to call it the "Demon Realm." And this last camp of survivors is called the "Capital of the Demon Realm".
Mainly focus on easy upgrade flow