Kateikyoushi no Lelouch-san

Why has Lelouch become C.C.’s tutor?!
Lelouch and Nunnally were living in peace, but then one day a spoiled rich girl with absolutely no common sense named C.C. moved in next door. At the request of his mother, Marianne, Lelouch has taken on the task of ensuring her education – and now he’s made a contract with C.C. to be her personal tutor…?!
A high school AU comedy begins!