Abe Harumi, a high school boy with a strong sense of justice, one day finds the school's idol, Annabelle Strix, surrounded by thugs at a park. He gets into an altercation to protect her and then gets stabbed. Thought that he had died, he was surprised to suddenly find himself back alive in a strange manor. He gets even more surprised when he found out that he had become a vampire, and the one that turned him was none other than Annabelle! Now, with her blood running through his veins, he vows to fight and protect her as part of her Familia. This is just the beginning of his new journey as a creature of the night.