The newly hired homeroom teacher, Genkoku, at Seishou Academy discovers that the female middle school students all have excellent marksmanship skills... and happen to be anthropomorphised international assault rifles:

There is short-tempered Funko (FNC, manufactured in Belgium's Fabrique Nationale), the proud, accurate Shigu (SIG SG550, Switzerlands's SIG company), the pitiful Eru (L85A1, UK's Royal Small Arms Factory), and the foul-mouthed, but caring Ichiroku (M16A4, American company, Colt) and Funko's best friend.

Reading various quite ominous signs in the academy's hallways: "Keep chamber empty in the school building", "Do not fire in the hallway", and "Keep your safety on at all times!" Genkoku is starting to wonder, what he is getting himself into.

— written by foo2

Note: It was streamed on Nico Nico Live three months ahead of its TV broadcast, starting on April 7, 2012. Additionally, it received several weekly early screenings at Gamers Akihabara starting on April 19, Animate Shibuya and 8 additional Animate venues starting on April 21, 2012, two screenings at Animate Nihonbashi on May 20, 2012, and June 23, 2012, and four screenings at Comic Toranoana Nagoya on April 28, 2012, May 26, 2012, June 16, 2012, and June 30, 2012. The regular TV broadcast started on July 4, 2012.

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Side story: Upotte!!: Miatte Waratte