Sora and Shiro are unemployed and never leave their house, but on the net, they're known as "Blank", an invincible team of gamers. One day, these siblings are visited by a boy named Tet, who calls himself god. Tet summons them to a world where all war is banned, and everything is decided by games.

Sora and Shiro have been abandoned in another world by Tet. In this world all war is forbidden, and everything is determined by games whose rules are determined by the "Ten Pledges" that Tet established. They find themselves in the country of humanity, the weakest of the 16 races in this new world.

A girl named Clamy has won the right to be the next king of Elukia by her overwhelming good luck. Steph lost to her and loses the chance to become the next ruler. Just as she defeats the last challenger, however, Sora and Shiro interrupt her.

The game Clamy challenged them to wasn't normal chess. Shiro is a chess master, but even she is helpless against Clami's assault. But when Shiro understands the real rules of the game, things begind to turn around. The battle to determine the king of Elukia, and all of humanity, finally reaches its end.

Sora, Shiro, Steph and Jibril devise a risky plan with even riskier stakes, making their way to the Warbeast embassy to challenge them.

Foul play is suspected when Sora is nowhere to be found after Shiro wakes up, spurring him to action.

While Izuna's abilities seemingly defy physics, Sora and Shiro make potentially futile attempts to amp up their game.