2.638 out of 5 from 15 votes
In a war-ravaged city, the local all-girls high school mandates firearms training for every student, and encourages them to help with the war effort however they can. Hiroko Tsubaki's club raises money by selling flowers, and the girl has nothing but disdain for the ill-bred violent girls that populate her school. But that changes when the elegant student council president Tsubame asks her to join the investigations squad for a secret (and dangerous!) mission.
Inside an abandoned tank on a weed-infested riverbed live hot-headed Velveteen and neurotic Mandala: two teens who usually amuse themselves by setting things on fire or trying to play Donkey Kong on a pager. The only other human around is their supervisor, a half-naked man who spends his days gunning down the imps and other oddities that lurk on the banks. These three are tasked with looking after this riverside, where the souls of the dead are forwarded, but due to a clerical error the dead have become prone to reviving and indiscriminately attacking anything around them. As the bodies pile up, the girls' home is no longer safe, and they must take up arms to defend themselves!
Another absurdist and violent schoolgirls-with-guns manga by Jiro Matsumoto. Velveteen and Mandala is longer/more fleshed out/better, but if you liked one you should definitely check out the other.