The Machine Girl (2008)

  As the picture attests, this movie practically reeks of campy fun. Like if Dead Man's Shoes had been made as a Grindhouse film. Oh, Japan. Will you never tire of scantily-clad schoolgirls-turned-cyborgs hungering for revenge? Let's hope not!

The story concerns Ami, a teenage girl who lives with her little brother Yu after the death of their parents.  Not sure if the movie ever actually says what happened to Mom, but we know that Dad killed himself rather than face the shame of being called a murderer. 

Side note:  This is a chief difference between Japanese and American films.  In America, you don't throw off a line like "I've had to look after you ever since Dad committed suicide rather than face a murder charge" without some kind of expositional flashback.   As a matter of fact, Ami finding out whodunit would probably be the whole plot of the movie.  But I digress...

What Ami doesn't know is that Yu is under the thumb of some yakuza's spoiled brat who ends up tossing him and his friend Takashi off a building.  Fun Fact:  Japanese schoolgirls turn into murder machines in the face of adversity.  Also, Japanese people don't have arteries; they have fire hoses.

Anyway, Ami gets caught by the yakuza parents and has her arm chopped off.  She escapes and seeks shelter in the machine shop of the other dead kid's family.  They fit her out with the wicked cool machine gun, which in no way is too heavy for a typical high school girl to lift.  The mom, Miki, even joins her on her quest to kill every last motherfucker standing after their shop is hit by (and I'm not even making this up) the Junior High Ninjas, and together they head off to the shrine where the yakuza family is hiding.

But wait!  There's more!  For the price of the spoiled sociopath kid, gleefully psychotic mom, and ninja-obsessed dad, you get FOUR OTHER VILLAINS!  See, the parents of the kids Ami has already killed form their own gang bent on revenge.  Outfitted in football pads, wrist pistols, and body armor featuring the faces of their dead progeny, they are probably the saddest group to ever try and deep-six a coed and her widow friend.

I'm not going to spoil the ending for you.  Just know that there are more lopped limbs, fountains of blood, gratuitous chainsawing, a drill-bra, and some pee-soaked pants for good measure.