How to Prove to the Demon Slayer Corps That Vampires Aren't Demons

Synopsis:

Vampires: powerful and alluring creatures.

But when a vampire transmigrates into the world of Demon Slayer, he's not so alluring anymore. In fact, he has a life-or-death problem to deal with.

Ji Yuan: How am I supposed to explain that vampires aren't demons!!!!

Theme: A reasonable explanation