From Naono Holics:

The novels are set in the Japanese court of 1000 years ago and follow the exploits of court astronomer, diviner, and exorcist Abe-no-Seimei and former prince and most talented musician of his time Minamoto-no-Hiromasa, as well as a large cast of deities, demons, nobles, monks, monsters and spirits. They are the foundation of the influential historical fantasy franchise Onmyouji.

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Translated chapters:

• How a Demon Stole the Biwa Genjou
• The Hiromasa Mimic
• The Bowing Woman
• Moon Path
• Heads
• The Rite of Taizan Fukun
• The Head Minister
• The Child With the Flute