Five hundred years ago, to practice witchcraft, a bat elf forces her sister, Siu-chu to lure strong men so that she can suck their blood. A priest stops Siu-chu from killing two guards by using his supernatural powers. After fighting, both parties are wounded. To help the guards cope with bat elves, the priest gives them string instruments, swords and thousand-year-old snow pearls. Unexpectedly, the guards swallow the snow pearls and it takes them five hundred years to resurrect……