Siblings Sora and Shiro are inseparable, both in the real world and in the game world. As a team, their individual skills combined make them invincible: Sora, with his astute intuition and penetrating insight; and Shiro, with her remarkable intellect that goes beyond prodigy-level genius. In the real world, they are reclusive and unsocial hikikomori, but in the game world, the siblings together form a blank space, a mysterious group of undefeated online gamers who win every…