Demonic Corruption

Ten years ago, a mysterious black fog suddenly spread, and a large number of creatures died mysteriously, making people aware of the seriousness of the problem. As everywhere fell into chaos, one-third of the world's population was reduced in just half a month. This disaster was called the "black disaster". In the years after the Black Disaster, the black fog gradually faded, and people began to rebuild their homes. The government divided the areas into 56 regions based on dense population. Not only that, some places where people once lived were marked as restricted areas.