Been lookin for this particular incarnation of this song....was only in 1 game I ever played, don't know if that game is where you got it from, but thank you for uploading it.
Because Anime girls with shotguns (Or pistols in this case) and fried brains are an AWESOME COMBINATION. And with some Nightcore mixed it.. its Like a big bowel of Ice cream awesomeness. :)
Me: whoops, clicked the wrong thing. beeter exit ou....wait a sec.... Five seconds later:*insert head bobbing, foot tapping , and general rave spazm here*
Guys it's a pistol, it says on the character's wikipedia ^.^ 'Natsuki's Elements are a pair of small pistols, with the spheres on the pistols providing it with unlimited ammunition.'