No Game No Life, Vol. 6 (light novel)

In a world where games decide everything--even national borders--a genius brother-sister duo aim to put their gamesmanship to the test...to save humanity!

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One fateful day, the One True God Tet collapsed from hunger in the back alleys of Elkia, only to be saved by Izuna. Tet recounts a story from 6000 years ago, about the 'Great War' that divided the heavens and tore the earth asunder. About the man who challenged the world and the girl who stayed by his side.