The internet is full of rumors about the Neet and Hikikomori genius gamer siblings Sora and Shiro. The two go as far as to refer to the world as a "shit game", but then one day a young man calling himself "God" summons them to a parallel universe. There, God has forbidden war, and "everything is to be settled with games". Yes, even the national borders. Driven into a corner by other species, the human species is down to its last city. Can Sora and Shiro, these recluses of society, become the saviors of humankind in this parallel world?