A office auxiliary, comming late at night suddently gets transported? summoned? reincarnated? Doesn't matter! What matter is that he is now trapped in a post-apocalyptic world that belongs to one of his favourite game universe, where the world was destroyed by an atomic confrontation.
Using his game knowledge and timeline of the history where he must use all his knowledge to survive and come on top in the Mojave Desert now called "Mojave Wasteland"