OVA & Vampire Cheerleaders Paranormal Mystery Squad

From the introduction:

As the strong-willed, gothy leader of the Paranormal Mystery Squad, Stephanie commands her band of misfits in the quest to quell the cryptid threat…and maybe make some good money while she’s at it. The death of her parents fuels her actions with a deep hatred for cryptids that’s difficult to keep in check. While the newfound “monstrous” nature of her companions, J.C. Summerfield and her sister, Katie, have softened her somewhat in this regard, Stephanie will still be the first to offer violence as a solution and the last to share sympathy where cryptids are concerned. Her inherent stubbornness and propensity to fly off the handle certainly don’t lend to making measured decisions either.