In the year 2048, a virulent, self-replicating nanomachine dubbed "The Scourge" decimated the world's population and left most of the world barren. The world fell into a state of perpetual lawlessness, where guns were worth their weight in gold and people with the most firepower were kings. In the midst of this chaos, our protagonist, the Gunrunner, offers a safe courier service to those willing to pay. This is the story of his travels across a desolate United States.