No Game No Life Vol. 6 (Light Novel)

Sora and Shiro are two step-siblings better known online as the legendary hikikomori NEET gamer duo Blank. To them, the real world is just another crappy game. One day, after receiving a strange message challenging them to a game of chess, the two are transported to another world called Disboard where everything is decided by games. There, the two meet the God of Games, Tet, and come to learn of the world’s 16 different races including Imanity, the lowest of the 16 consisting of humans and other non-magical beings. So begins the duo’s journey to unite the races through games and ultimately become the realm’s new rulers.
Notice: This book is written in Japanese.