No Game No Life, Vol. 2 (light novel) — Yuu Kamiya

After having been summoned to the world of Disboard, where a boyish god has declared that all conflicts must be resolved via games, the genius gamer siblings Sora and Shiro have ascended to rule over the strange world's embattled humans. Now brother and sister must challenge the other races directly, and the games are afoot Will Sora and Shiro be able to stand against the might of the angelic Flugel race? The next chapter in the hit fantasy series begins here.