The human powers-that-be called for the purification of mankind and the eradication of vampires and ‘deviants bloodlines’ - those born of a mix of human and vampire. And so began massive purges of the deviants that were reminiscent of the 'witch hunts' of centuries earlier. Leading the genocide was the exorcist corps the 'Gun Bullet Children'.As the overwhelmingly large human armies began to obliterate every vampire and deviant community across the world, the opposing deviant armies sought to gather allies and rally back. Ria File is a half-human, half-vampire girl fighting on the side of the deviants as they embark upon a turnaround strategy, the 'Siege on the Holy Land'. Their plan: to lay siege upon the humans’ 'Holy Land' and to destroy the Holy Lady Anhel who was the source of the human military power. This is a battle in which defeat is an option for neither