Hallelujah Vamp

is a Japanese light novel series written by Kozaburo Yamaguchi, with illustrations by Gaou. The series began publication on June 10, 2012 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Haruya, a high school student who is a vampire hunter apprentice, helps a girl, Thea, who gets lost one night. However, the next day, he and his friends are attacked by a vampire and are killed.

The next time I woke up, the night was unharmed. On a suspicious sunny night, Thea tells. "I gave my blood to Haruya's body with this fang." From this day, Haruya, who became a vampire while hunting vampires, and the vampire princess Thea, who is chased by both friends and humans, are a strange master and servant.

The relationship has begun ──!