You are a lone-survivor in a world ravaged by the undead and mutated freaks left after a mutagenic virus had gone airborne
The world is in shambles, or you think it is. The Fall left what was left of the world in a disorderly, infected land. Zombies became the apex predator due to what was claimed to be an mysterious mutagenically evolutionary/adaptive airborne virus that ravaged the entirety of the whole world as we know it, the uninflected were just prey to whatever mutated freak of nature there was lurking
Being stuck on your apartment floor since The Fall, food is dwindling down to your last packages with water slowly following after. You have no knowledge of if there are infected are on the other floors, if any at all. The doors to the emergency staircase are boarded with dressers and heavy boxes, and the elevators broken due to the loss of electricity.
Your goal is to adapt, endure, and survive. Helping others or saving the world, it really doesn’t matter in the slightest as long as you survive.