One of the most powerful onmyouji from the era of Abe no Seimei. He was Abe no Seimei's rival and fought him nearly a thousand years ago. Ashiya Douman has shown interest in Yakou's reincarnation and seems to have connections with the Twin Horn Syndicate/Bicornis Fellowship and Kakugyouki. He also fought Jin Ohtomo, which resulted in Jin losing his leg.
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