Police Detective Hoshino (Kanji Tsuda) investigates the murder of a maid at a mansion belonging to Miyako Rozmberk (Sugimoto), a seductive vampire mistress and cougar all in one. Ukyo Kuronuma (Jun Kaname), an Edo-era swordsman who was turned into a vampire by Miyako is fingered for the crime but before anything can be done about it Hoshino ends up under Miyako s spell as well. This leads Hoshino and Ukyo to battle one another for the privilege of staying with Miyako for eternity.