Charenjā (挑戦者 《チャレンジャー》)
After beating the princess of Elkia at rock-paper-scissors, Sora and Shiro move into the palace with her and plan their next steps.
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”.