Rasuke is not well. Every few days, he wakes up on the ground somewhere, with a dead body. He doesn't know anything about how these apparent murders happened, but he is the main suspect.
Add to this the fact that in a village of other intelligent creatures, Rasuke is the only human, and thus the town freak. Though he participates in the local rituals, he also longs for a taste of human culture.
Meanwhile, a man back from the dead works with his demonic grandson to save their kind from the torment of the religious zealots that seek to destroy them. They are searching out a select few in the world that have unimaginable powers, and in the midst of war and destruction, what they find is Rasuke.
But of course, the question is, why would they possibly want someone like him?