"Nee-chan help me with homework! " "Nee-chan, they bully me! " "Nee-chan let me help you with chores" " Nee-chan, I won't dissapointed you this time" "Nee-chan is kind person I meet along with big bros" What if (Y/n) not just taking care of one little brother but three brothers and one little sister. (Note:All character belong to Ken Wakui and Kanao belong to Koyoharu Gotouge) (Warning:This book not following the original story and this will contain some manga)