The Holy Maiden of Purification and the Knight of Monster Hunting

In that castle, there were two women who opposed the demonic. One was a Sister who performed purification and blessings in the chapel. The other was a knight covered in blood in the depths of darkness, hunting monsters. The two opposites were gradually drawn to each other. However, one night, the knight who returned from a hunt had a pale face. Bitten by a vampire and corrupted by the demonic, she pleaded with the Sister. Before she could turn into a vampire, she begged her to purify her with her own hands—to kill her.