Lycoris Recoil, Vol. 1 (manga) - Kiki Piatkowska, Yasunori Bizen, Spider Lily

Japan—a nation where vicious crime and terror have been all but eliminated. And who keeps the peace? Cute schoolgirls, of course! Those uniformed youths you see on street corners and in stylish cafes may just be agents of Lycoris, with pistols in their purses and missions on their mind...