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”. He transports them to another world where games mean the difference between life or death.

Adventure, comedy, fantasy, sci-fi. This anime was super popular a few years ago when it came out. Becoming a lost gem now, it's well worth watching.