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 and Shiro leave the running of the country to Steph and spend every day playing video games. Steph's hope that they would become not only the saviors of Elukia, but all of humanity, crumbles away.

The siblings confront Jibril, a member of the Flügel race to reclaim the royal library in a game of Shiritori.

Intending to challenge the Werebeasts, the siblings discover that it's hard to come with a strategy to defeat the latter, as all memories regarding the games are erased from their challengers, until Stephanie entrusts Sora a key left by the former king, leading to his secret research on how to outwit them.

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.

Sora, Shiro and the rest prepare themselves for a game with the Warbeasts through trust exercises and cunning strategy. The stakes are high, but Sora, as always, has a plan.

Izuna, though powerful, has been matched in gameplay. This first person shooter will test their limits in virtual space. As tensions flare, friendly fire becomes imminent.

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