Kuuhaku
Kuuhaku ( 空白 / くうはく) is a japanese word, meaning "blank"
Why you left your answer sheet kuuhaku?
kuuhaku
『kuuhaku』 is the online game username and account shared by Sora (空) and Shiro (白) main potagonists of teh anime and manga " no game no life " , that kanji for kūhaku (空白) is a compound made of kanji from names of both protagonists: Sora (空) and Shiro (白), which is probably how the name originated. ("空" can be read as "kū" and "白" can be read as "haku" when used)
『kuuhaku』means "Blanc "