As supernatural enemies close in, it becomes clear that Katsuo isn't the only one with a dangerous secret.
Sword and Mirror is the first book in the Yokai Treasures series, a timetravel romantasy set in sengoku-jidai (around the same time as the Shogun is set), richly inspired by Japanese folklore. Fans of Inuyasha will love it. Each book in the series follows a different couple, interconnected by the overall story about certain items of power.