On the Internet, they're legends: the tag-team duo know as BLANK, famed for their incredible game-playing skills. In the real world, however, the lives of 18 year old Sora and his 11 year old stepsister Shiro have been spiraling out of control. Now existing as shut-ins, they rarely leave their house and are unable to be separated without suffering panic attacks. Games, for them, are the safest retreat from reality. Until they win a chess match against...