The world is overrun with monsters called Nemesis-and a young boy infected by them will stop at nothing to defeat them all!

Seth is an aspiring wizard living in a pastoral village under the watchful eye of his mentor. Like all wizards, he is an infected: one of the few living creatures that has survived contact with a Nemesis, creatures fallen from the sky that contaminate all they touch. His apparent immunity led him to choose a path that seemed to be a perfect: to become someone who hunts and fights the Nemesis. But Seth longs for a quest that goes beyond the simple hunt for monsters. He wants to find their home, Radiant. Along with other wizards, he travels the world in search of Radiant, under the sinister eye of the Inquisition...

Somewhat better at controlling his powers, Seth and company head for Rumble Town. Their mission is to capture a living Nemesis! But the Inquisition holds Rumble Town in an iron fist, and they're promising a tantalizing reward to whoever captures Seth! Plots, manipulations, betrayals, a hunt for the infected: the confusion reaches its height when the mysterious bandaged Grimm arrives. Who is he and why does he attack wizards when he himself seems to use magic?