This manga I'm lookin for is about this girl who goes to some elite school with her best friend. But the school is really different it's separated by 2 different class/level (don't know the right word). The two “classes” are by Aristocrats (or Nobles) and Knights. There is also magic involved kinda like FREEZING. Where they got that kinda magic (magic involved) bond. This is all I could remember but I know it's smut, or ecchi, or mature. Oh and you can have more than one Knight. Knights have to obey their masters every word no matter what it is! In the manga it shows the main characters friend timidly serving her master. Any info is appreciated!!
