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"Twitter" is a web service that is extremely popular all over the world now posting and sharing short sentences with 140 characters or less. And this is a rumor..., there seems to be a humanoid interface to observe users and develop functions in order to improve the contents of the service more. Yes, this girl is "Twitter-san."
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. Alongside their always-in-harm's-way homeroom teacher and other classmates such as Jiisuri, Ichiyon and Faru, the girls will live a very eventful school life full of shootouts and special training.