Ami's a beautiful, popular kid for whom the future looks pretty good. But when her high-school brother gets bullied for money, and the guy after the cash just happens to be the vicious son of a crazy Yakuza crime boss, you know all hell is about to break loose. When Ami's bro can't pay enough, violence breaks out, he is murdered and Ami is bound, tortured and has her left arm hacked off as a reminder not to screw with the Yakuza. But his is one chick who doesn't take any shit! Barely alive, she is taken in by a mechanic, who builds her a prosthetic limb with a difference – it's only a fully automatic machine gun!