Puella Magi

Puella Magi (魔法少女 - Mahō shōjo) or "Magi" are young females who are contracted by Incubators for the purpose of combating witches. In Magi/Hunter history, they are known as the "Firstborn" and "Sister(s)" to the Hunter Species, the "siblings" working in tandem with one another to combat witches and archfiends while secretly serving their true purpose known only to the Incubators and those curious or clever enough to seek out the truth.