Set in a fantasy world inspired by ancient China, the narrative follows Fuuren, an armless Defender. Defenders are individuals who will see their missions or assignments through to the end, provided they accept them in the first place. Fuuren is summoned to a small town on the verge of being conquered by the Ka Empire; the locals hope to hire him to assist their forces in defending their settlement. However, some intrigue exists within the town itself, leading Fuuren to accept a completely different task.