They trusted each other, so they left the Moon Rune at the center of the village, unguarded. And one day one of their number stole it for themselves, and fled. The remaining vampires were left with a choice: feed on humans, or stay in the village, and starve. [ He shrugs. ] Most of them stayed. But some didn't.

The first vampire doesn't need to drink blood like the rest of them, so… she's been hunting down the remaining vampires ever since. Do you need me to describe how she abandoned me in a ditch, or is that enough?