An evil Duke attempts to kill and collect the blood of a royal family of European vampires in order to become all powerful. The only surviving member of the family travels to Hong Kong, only to complicate his struggle by falling in love with a mortal girl who just happens to have a vampire hunter for a brother.

Set in Flower Capital, a land ruled by an Evil Queen. All men in the kingdom are slaves to women. However, a prophecy foretells that one day, the Star of Rex will find and wield a mythical sword, rise to power, overthrow the queen, and restore the balance of the two sexes.