In this fantastical tale of demonic battles and courtly intrigue, an onmyoji known as the "Heretic" faces a destiny that could overturn both the human and demon realms!

After securing the first two Sacred Relics, Fuzuki, Hakuro, and Ranmaru are immediately summoned to appear before the imperial court, where they're plunged into political scheming and a cutthroat fight for possession of the Relics. Just as the situation seems most dire, the emperor himself intervenes! In the aftermath, the hidden bonds between the sovereign ruler of the land and the heretic onmyoji are revealed.