I was recently relistening to my Charisma.com albums, if I'm after fast-fire female rap vocals where should I head? Easy Breezy (the new Eizoken OP) is pretty close to what I'm looking for I think, might check out their other stuff.
Since someone's already posted Koutei Camera * stuff, I feel like ame to kanmuri also works:
By far my favourite of that constellation of bands/artists. Less rapid-fire/aggressive than Charisma.com, though.