History repeats… or does it?!
As the end of the game in sugo-rōku against Old Deus approaches, Sora and Shiro face a task from Jibril—a real-time strategy occurring during the Great War, before the world of Disboard changed. As leaders of the weakest race, the imanity brother and sister have one goal: that in this version of the War, no one dies. But when their opponent, Old Deus, demands they choose one sacrifice, Sora and Shiro will have to come up with some unconventional tactics to ensure victory!