The Last of Us
The Last of Us starts us right at the beginning of the outbreak that sets off the apocalypse: a mutant strain of the Cordyceps fungus that ends up mutating humans into uncontrollable, vicious monsters. 20 years later (is this starting to look like a trend?), the world is living through it all, set in various settlements in quarantine zones looking to keep law and order up to check. Opposing the quarantine zones are a rebel group known as the Fireflies, who have their own agenda for what the world needs. And while these zones may be difficult to live in, the outside world is also filled with both looters, raiders, and the mutated humans themselves. While The Last of Us is a very brutal world filled with some very horrifying adversaries, we see later on in the game that it is re-growing, and nature is working its way back in; so not all is lost.