Haiiro no Onmyouji  

灰色の陰陽師

Sabatora, a young man who lost his parents due to Kuragari, seeks vengeance through his job as an Onmyoji for the Public Security Bureau. Despite his tragic past, Kyue, his childhood companion who has lived with him since his early years, remains kind-hearted and indispensable to Sabatora. However, one day Kyue is attacked by Seto, another Public Security Bureau member who harbors hatred towards Kuragari. In a moment of desperation, Sabatora and Kyue undergo a sudden transformation.