Jagatud heli

This world was a bleak place where a mysterious mist called Magi twisted everything. Because of the Magi that turned animals into Demonic Beasts, humans into Demonkin, cities into Dungeons, and forests into Demonic Realms, humanity gradually lost its footing. In the end, after countless trials and errors, humanity chose to build walls and live quietly within them. That was the entirety of this world setting that I had figured out. However, in the year I turned eight, a piece of the setting