Welcome to Redox!
It is said that the bacteria came from a tree. When the first outbreak happened people sought refuge, and they turned to Sootopolis. With a naturally small population the city could afford to take in people. But when they were starting to get overcrowded the doors shut. People now had nowhere to go.
Many years have passed since the first outbreak. People have adapted and most of them live a normal life inside the walls of Sootopolis. However not everyone survived. Some might still be roaming out of the walls. Where do you fit in?