A police detective finds himself running with the creatures of the night while investigating a gruesome murder. Detective Hoshino questions a slain maid's former employer, an ethereal beauty named Miyako Rozmberk, in hopes of landing a solid lead before the statute of limitations runs out. When Miyako's tip leads Detective Hoshino to Ukyo Kuronuma, the fact that the man is found attempting to feast on a frightened young girl seems to indicate that he was indeed the killer. But shortly after learning that Ukyo is in fact the famed shogunate-era swordsman Okita, who has been transformed into a vampire by the powerful Miyako, Detective Hoshino, too, becomes born-again as a deathless bloodsucker. Later, when Miyako's loyal servants wage a vicious fight to become her one and only companion, Detective Hoshino realizes that even in death, the struggle for survival never ceases.