Kyoryu and Yuya are a brother and sister who have a close relationship and live in the shrine. They have become national-level Onmyoji at a young age.
In an accidental incident, Yuye learned that since his father was the hope of the demon clan, and he was also the young master of the demon clan, in order to dominate the three realms, the demon clan would do anything to awaken Youye's memory...
Can the demon clan's plan succeed...