When I was a kid in the 1990s (possibly early 2000s) I remember checking out this graphic novel from my local library (in CA, USA) several times. It was volume 1 and the back cover said volume 2 was out now, but I never read it.
The protagonist was an awkward blonde teenage girl with glasses; she was a huge history buff/nerd and didn't have any friends, except this one guy that she had a crush on. She was especially obsessed with the history of the small town she lived in with her aunt. One detail I remember is the crush using the phrase "same bat time, same bat channel" when saying goodbye to her. I didn't know at the time that it was a TV reference, so it just seemed like a weird thing to say.
The plot is that a mysterious stranger moves into the historic mansion previously owned by the town's founder. The mysterious stranger is actually a vampire, and also the aforementioned founder of the town. They strike up a friendship. The climax is when another (evil) vampire shows up and the two vampires fight; during the fight, she also gets turned into a vampire to assist. The good vampire wins, but does not survive. In the end, he leaves everything to her in his will, so now she and her aunt live in a big mansion, and she makes friends at school and starts dating her crush. And she's a vampire.
No, it wasn't well written, but I just can't remember the name and I'd like to know! Do you know?