Magic Gunner Rin

From [Turtle Paradise](http://www.mangaupdates.com/groups.html?id=1690):

Vol 1-4: Rin Tohsaka is a bounty-hunting Magic Gunner known as “The Crimson Witch”. After taking a job to protect a little girl from the mafia, Rin finds that her client might need her protection even more than his younger sister.