Majo-gari no Kishi ~Jinkaku Ten'i no Ori~

Witches are wreaking havoc throughout the empire. Hunting supernatural is the work of Aria Marianne, one of the sixteen knights in the service of the emperor. She does battle countless time with the witches, until at last she finds herself in a bad situation! What will become of Aria and her brother Cyril?

[From DLsite English]