As a modern person, I suddenly transmigrated to 1970s Western Europe.
I got caught up in the battle between vampire hunters and vampires.
After driving a silver axe into the last vampire countess,
"You know, that's just how the laws of nature work. When only one vampire is left, it becomes an endangered species that can't be killed, no matter how hard you try."
"But you're about to die."
"Mm-hmm, because the second vampire just finished transforming~"
"Huh?" A searing pain suddenly shot through the hand holding the silver axe.
"Hehe."
Of course, none of the above is the main story.
The main story is a slice-of-life tale that begins when someone transmigrates from the modern era to the 70th century, becomes a vampire princess, and manages to survive in the royal family all the way to the modern era.