At the end of the eternal Great War, the world where everything is decided by games, and "Disboard, and " is born as the means to an end are changed from violence and force to games and wagers. But winners still trample losers, and the victims pile up. A young shrine maiden laughs at how nothing has changed. As the gamer siblings Sora and Shiro play a dice game where the number of dice you have is determined by your age, everyone seems to be against the pair. Will they survive, or will they lose the game - and their lives?