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By far my favorite book series is "Vampire Hunter D"! Not to be confused with the manga or anime versions - it's the actual novels.
The reason I love them so much is because of the imagery that the writer evokes with the way it is written. It's basically about a traveling dhampir (half human half vamp) who takes jobs hunting vampires for people being haunted by the supernatural beasts. It takes place super far in the future with advanced technology which puts an original spin on worn out vampire fiction. I'm not even into vampires tbh and I love the books. Great sci-fi horror!
It sounds a lot like Vampire Hunter D to me. The novel (which I linked), not the anime.