Tsukuyomi: Moon Phase

Kouhei Morioka, a freelance photographer, travels to a German castle to capture paranormal activity for his friend's occult magazine. He encounters Hazuki, a vampire who attempts to turn him into her slave, but Kouhei surprisingly remains unaffected. Hazuki and Kouhei eventually escape the castle with the help of his exorcist cousin Seiji, and she later flees to Japan in search of her mother. Kouhei allows Hazuki to stay at his home, where they form an unlikely bond, while other vampires search for her.