The world burns.

Damian Traynor leaves home for the first time, hoping to escape grief by throwing himself into his art. Not long after he departs, disaster falls upon his home. From a distance, he watches as friends, family, and history disappear in flames.

Worst of all, he believes himself responsible.

Now, the only hope to fix everything is the brass machine.

Stuck in a strange land, Damian encounters the demon Gokko, who bends his will and alters his life's trajectory. With the demon's unique powers, he makes it his mission to kill the Yokai, siphon their magic, and force the brass machine into submission.

In another place and time, Kitsune and Myobu celebrate their reunion. Plans are disrupted when the brass machine alters their path. Together, they learn the story of Tsukumogami, relive past traumas, and discover the truth of Kitsune's father, King Oni.

The pieces of history fall into place, and Kitsune and Myobu find themselves hurtling on a collision course with Damian and Gokko. As past and present intertwine, the evil plaguing Kitsunetsuki becomes clear. All must work together alongside the brass machine to rid the world of malice for good.