After the end of the world Anastasia is left only with her brother Ethan to survive what's left of the world. But even her brother is taken away from her and with the help of Michael, who is none to happy to give it, she must traverse the wasteland and save her brother. Along the way they'll have to deal with the greys that now infest the world and the numerous human factions that are fighting for control over the remnants of civilization.