Kitsune-Mochi. Kitsune Tales, #2

Sequel to the award-winning Kitsune-Tsuki Following the search for the shape-shifting kitsune, onmyoji Tsurugu no Kiyomori serves Naka no Yoritomo and his new wife Kaede, protecting their household from the supernatural and warning of more mundane threats. Elsewhere, a murder is committed in Naka's name, and an exiled onmyoji determines to wreak his own justice by destroying Naka no Yoritomo and his bride.
just as word comes that an immensely powerful yokai is moving, coming to Kaede. Now Tsurugu and his allies must protect his shugo's house from a dangerous rival without revealing their own treacherous secrets - or they die by the hands of their friends instead of their enemies.