Morioka Kohei wanted to become a photographer, but all pictures turned out just to be ghosts. When he visited an old castle in Germany, he met a vampire girl, Hazuki. Hazuki was confined in the castle. She tried to suck Kohei's blood to make him her slave, but it didn't work. However, because he happened to break the device to seal her into the castle.
Hazuki succesfuly escaped from the castle and left for Japan to look for her mother. When she arrived in Japan, she went to Kohei's house where he was living with his grand father, and began to live with them forcefully, because Kouhei had lost his mother during his childhood, Hazuki reminded him of his childhood and helped her to look for her mother. Then, another vampire girl, Elfried, and Count Kinkell came to Japan in attempt to bring her back to the castle.