Mami Kosuge

The girls are personifications of firearms. Assault Rifles primarily. The story follows the FNC, M16A4, L85A2, and Sig 550. While the plot itself isn't deep or motivating, the series is filled with fun adventures and incredibly accurate facts regarding the various firearms.

Life in a small city needn't be boring. Not when your city is home to a host of deeply odd people. Granted some residents, like high-school buddies Mio and Yuko, are fairly normal. Yuko is a world-class space-case and Mio has an unusual mastery of wrestling and boxing, but... okay, so they're odd too. Together with fellow residents such as Nano, the frequently modified robot of five-year-old genius the Professor, talking cat Sakamoto (that's Sakamoto-san to you!), and their own friend, the poker-faced lunatic Mai, they lead provincial lives that are perfectly mundane and thoroughly bizarre.

At first, Takayuki Narumi is befriended by Mitsuki Hayase only because Mitsuki's best friend, Haruka Suzumiya has a crush on him; however since then, Takayuki, his pal Shinji Taira, and Mitsuki have grown to be the best of friends. Then one day, Haruka confesses to Takayuki her love for him. Not wanting to hurt her feelings, Takayuki agrees to go out with her. After a few incidents, their relationship gets intimate, even while Takayuki and Mitsuki begin to realize their feelings for each other. But suddenly, when tragedy strikes, things are never the same for these four friends again.