In the year 1108 of the official calendar of the Pajan Empire. In this tumultuous period, commonly called the Asagiri era or the mist era, the major clans have been breaking up for decades to seize power. Far from the battlefields, Okko, the masterless rônin, is at the head of a small group of demon hunters and thus surveys the lands of the empire. He is accompanied by Noburo, a singular giant who hides his identity behind a red mask, and the monk Noshin, a fantasical monk and great lover of sake. The latter has the ability to invoke and communicate with the forces of nature. Tikku, a young fisherman, will appeal to Okko to find his sister, Little Carpe, kidnapped by a horde of pirates. But such a mission has a price. It will lead the four adventurers far beyond what they had imagined.