Revolution hero Aisyō returns to his native Polesya to take a post as governor. But instead of a calm life alongside loved ones and his people, a demon awaits him—only in the form of an ecological catastrophe that destroyed the capital of Polesya, Iolim. Now Aisyō and his three unwilling companions—an awkward priest of a forest cult who escaped detention, a prince who fled under arrest, and his pursuer, a secret agent—have to discover the reasons behind the disaster that already threatens all Polesya, and free the residents of Iolim who have ended up captive to one of the Eternals—the Great Forest. But are these trials possible for someone who has long known no peace?