Both Fujimura-kun Mates and Mission! School are gag manga with brutally hilarious punch lines. In both, the humor is also delivered by characters honesty (you know, les enfants terible kind of thing). Not to mention that the girls in both of those series seem to be lacking a great deal of common sense. If you liked the humor in one of those manga, odds are you might like the other one as well.
Funko, Shigu, Eru and Ichiroku seem to be typical school girls on the surface, but they're actually powerful, dangerous guns that must be treated with care and respect! Together, they attend Seishou Academy, a special place where not only are all of the students guns, the teachers are as well. That is, except for one new educator who arrives, unaware of the crazy, dangerous times that lie ahead!