Five hundred years ago, as legend goes, a feudal lord was attacked by demons wanting to retrieve his mysterious inner power to take over the human world. The famous mage, Tokimori Hazama, was called upon, and with his 2 students, managed to save the whole land. But they fell ill for three days, and upon returning to the manor, found everyone inside the house dead, including the lord. The lord's power was also buried with him at the site of the Karasumori manor.