Sora and Shiro are siblings and also excellent gamers. Their talent and skills are unparalleled, as a team they are unbeatable. However, they want to have as little to do with the real world as possible. One day, they are challenged to an online game of chess. When they win, their challenger reveals himself as "God" and teleports Sora and Shiro into his own world. In this parallel dimension, everything is decided by a game, even the possession of a land can be won by a game. Their first goals in this new world are also set right away: to find a place to sleep, seize the royal throne and help the weak human race to its former glory. On their way there, they have to defeat countless opponents of other races.