Ekisupāto (熟練者 《エキスパート》)
After calling out Clammy for cheating, Sora squares off against her in a chess-themed war game, but she soon tries to cheat again.
They are both NEETs and Hikikomoris… but on the internet, the genius gamer siblings Sora and Shiro are known as the undefeatable “__” (blank). Sora and Shiro’s talents and skills are so abnormally good they are considered as urban legend. One day a young boy Teto appears before them, claiming to be “One’s Lord”.