Investigating the murder of a maid, Detective Hoshino interrogates her employer Miyako Romberk, who lives in an old mansion. The beautiful and seductive Miyako indicates that the murderer is a man by the name of Ukyo. Hoshino infiltrates Ukyo's den and witnesses him hungrily biting a young girl who begs for her life. Ukyo turns out to be a Samuari from the sogunate period who once shared both blood and body with Miyako, thus beginning his undead life. But soon Hoshino is converted too, starting a bloody battle between the two men over the beautiful vampire Miyako.