No Game No Life, Vol. 8 (light novel) — Yuu Kamiya

History repeats itself...or does it?!With the end of Sora and Shiro's dice game against the Old Deus fast approaching, they're faced with completing Jibril's final task-a strategic simulation game set during the ancient Great War, before the world of Disboard changed. As leaders of the weakest race, Immanity, the gamer siblings have one objective: Ensure that in this version of the War, no one dies. But when their Old Deus opponent demands a sacrifice, Sora and Shiro will have to come up with some unconventional tactics to secure victory!