Shinkurou leads a double life. During the day, he leads a normal school life with other students, but when the sun sets, he heads out to the town to hunt the vampires that have slipped in among humans. One night, he comes upon a girl surrounded by vampires. He takes care of the vampires and takes the fainted girl to his home. However, he soon finds out that she isn't human. How will a vampire hunter like Shinkurou deal with Luna, the last vampire princess who doesn't know much about humans at all? An action-based game featuring vampires (including man-made ones), lycanthropes and vampire hunters.