Jiro Azuma is descended from of a long line of shinobi, and he also can talk to animals. One day, he rescues a very unique black cat named Rago, a supernatural being, and is dragged into a secret supernatural war.

Inside the illustion generated by Fuyo, Jiro and Rago face off against a giant mononoke named Amagi. In the Edo period, Amagi attempted to recruit allies to fight back against the newly formed Oniwabanshu, but Rago refused to join him! What secrets lurk in the depths of Rago's lost memories?