Kakuriyo's LN author also wrote another series, Ayakashi Oniyome Nikki (Ayakashi Demon Bride Diary), that takes place in the shared Kakuriyo universe.
That one is an SOL series set in Asakusa, whose hero and heroine are the human reincarnations of the Great Youkai Shuten Doji and his wife, Ibaraki Douji, respectively. Both retain their past life memories, although the hero is more content with living as a normal human. The heroine prefers intervening and helping out in Asakusa's spirits. One of their friends, Yurihiko, is the reincarnation of the legendary Nue/Japanese chimera.
It's revealed the Master was good friends with Shuten Doji, and one of Aoi's relatives is an field agent/powerful onmyouji for an organization that handles spirit affairs in the Apparent Realm.