Exquisite Blood: The Heretic Onmyoji 04

Fuzuki and Toyochika first met as children, when Toyochika was an onmyoji in training and Fuzuki the crown prince he was sworn to protect. But a horrific incident caused their paths to diverge, and now Toyochika harbors an unyielding anger toward his former liege. The deep bonds of the past aren't so easily severed, though, and the two onmyoji must work closely together again in their fight against the demons of the Basara Clan.