This is a world that seems to be an infinite city. Each building has 20 floors. You can't go to the bottom of a building the lowest you can go is the 10 floor before the stairs go straight I to a solid floor. other buildings are connected to each other by bridges. There are people with masks roaming the area, they can be tamed by people who put on a mouthless mask once you put on a mask with no mouth it gives inhuman abilities before it shatters into pieces. The people with masks are violent.