Photographer Kohei Morioka, while on assignment for a magazine devoted to the occult, enters a dark castle in Germany where he encounters a young vampire girl named Hazuki who tries to turn him into her servant. While Kohei doesn't succumb to Hazuki's will, he does set her free from the barrier keeping her in the castle. He is surprised to find her living with him in Japan.
While on assignment in a remote German Castle, Kohei Morioka stumbles upon a young girl trapped there. It turns out that she is a young vampire with a split personality disorder. Hazuki tries to create him as a servent but for some reason the bite didn't work. Feeling sorry for her, Kohei still helps her to escape from the castle and that would be the end of it, however...
While coming home, Kohei finds that this Hazuki has followed him home like a little lost cat. Together, Kohei and Hazuki go to find her mother that is somewhere in Japan. But the vampires that locked her in the castle won't let her leave that easy.