Sabagebu! - Survival Game Club!

Synopsis

Momoka's family moves a lot, so she's always "that new girl" and the schools she's attended have all blurred together. Until her first day at Aogiri High, that is, where she's rescued by an armed vigilante, assaulted by a platypus, and coerced into joining a secret organization of gun-toting female commandos. Okay, maybe that last one is really just the school's survival club, but the platypus is real and so are the extremes that club president Miou is willing to execute to recruit Momoka.

Can uber-jaded Momoka's body armor-clad heart resist the charms of a girl who's all too ready to whip out her twin Desert Eagles in defense of another girl's virtue? Especially when it turns out that Momoka has her own talent for air pistols and senseless violence?