Little is a vampire girl. Radou treats her like his little sister and Vlad Dracula is like her father, though they are not blood-related. One day, their hiding place is found by vampire hunters and they are forced to get out of a town. Where they arrive is Japan. They sleep at an old house during the daytime and act as vampires at night. Little meets a boy and longs for human life. Radou denies it, but Dracula allows her to join a school. She makes friends and enjoys her school life. But one day, a messenger comes to their place and tells them to go back to the devil world….