The story is clichéd.
Long ago, a King, in pursuit of immortality, sold his soul to a vampire, and since then the people were ruled and tormented by the evil vampire nobility, suffering enslavement and agony.
Unable to endure the harsh exploitation and oppression, the people rose in rebellion, vowing to never submit, compromise, or give up, until death do they part.
And so, as you wished, all the resisting lowlifes were exterminated.
Among these lowlifes was a girl, who, because she resembled the deceased daughter of the vampire Prince, was taken as a replacement. She was given the initial embrace, brainwashed, and turned into a Night Walker Knight, becoming a hound for her nemesis, hunting her own kind and comrades.
Then one day, she succumbed to the Blood Thirst, nearly dying, and was rescued by someone.
And with her rescue, those memories and hatreds, long buried by death, were also brought back.
