Ninja and animal lover Jiro Azuma's life is changed forever when he finds himself in the middle of a war of ninjas vs. demons. 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 illusory world 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 government ninja squad, but Rago refused to join him!
What secrets lurk in the depths of Rago's lost memories? And what's behind the sudden string of mass murders happening in the real world?