I did not know that about Dracula! The Jinrou thing makes considerably more sense if vampires at least have some historic positive connection with wolves. I think the servant thing was mentioned in Shiki, but all of the vampire stuff I know of (which isn't much--I actually have no love at all for monster horror) is modern. Sunako's classier than that, she sticks to the classics, to stories about vampires who aren't all lovely, tragic and having way too much sex for beings without a working pulmonary system.

I'm sure the novel will go into it more, but so far I'm noticing Seishin focusing a lot on people's right to their own faith, however they define it, and how being true to it is essential. The Ohtsuka case gets an outburst from him that people dare to ostracize them; it might be the only time, short of pushing the idea of danger with Toshio, that he's been very adamant about anything. He's really into the former Kanemasa martyr guy's story too. I'd be really surprised if all that doesn't turn out central to his development. But then almost all of this is completely absent from the anime/manga....