In 2000s, human beings have lost their purana, which are essential for living things. It means that human species is going to die. However, a vampire saves human beings from extinction by revealing the secret of purana. In a mythical era, there was a god who was punished eternally because he had brought the fire to the human beings. Like him, the vampire will be punished because he breaks the taboo to tell the secret of purana to human beings. That vampire is named Duo, and the vampire who punish him is Zieg. They used to be good friends...