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 challenge Kurami to a game in hopes to dethrone her and take the throne for themselves. She chooses a simple game of chess, but is it just a simple game of Chess?