Sabae no Ou

Hunter OPS's rookie vampire hunter Ain and her master, vampire hunter Rizeru infiltrates a certain deserted village in South America. Code 593 is activated because it is believed that this settlement has become a nest for vampires. There is also an unmanned military shelter below the village, accesible only by an elevator... Armed with guns, swords, arcane powers and with your guidance; will they be able stop these vampires? Or will they join them in the end?