Murcielago, Vol. 1 by Yoshimurakana
Mass murderers may not have much by way of careeer skills, but Kuroko Koumori seems to have landed her dream job as a hitwoman for the Tokyo police! A license to kill other killers? That's some serious job satisfaction, right there!
About the Author
Yoshimurakana is the creator behind the delightfully twisted Murcielago.