The Takagami brothers return to their mother's hometown only to find out that she was the last Priestess of the Water and that the elder sibling, Noboru, is now the head of the Mizuchi Family. Töru, on the other hand, is currently being targeted by Yökai for the power he possesses. In order to protect him, the Guardian spirit, Kügen Tenko, is released from the seal that held her captive...