Constructed solely for war, sayabito are fearsome human weapons who are tightly bonded to those who wield them. In the wake of a great war, fiery and impatient Rivia and her willowy, cautious partner Kuifa roam the land in search of sayabito who lost their wielders in the conflict, in order to register and protect these vulnerable sayabito before they wither away or are exploited. Though Rivia and Kuifa frequently exasperate each other with their clashing approaches, they share one common goal: to carve out a life in the peacetime for which they, and others like them, were never meant.
After lazing about at Protettori headquarters, Rivia is sent to help stonemasons fix a long-neglected main road in town. As she navigates big personalities in the crew, she learns what it’s like to build something not only beautiful, but also integral to the community. However, when the police crash onto the scene, Rivia realizes she must act fast, with or without Kuifa. Later, at the capital’s renowned opera theater, a familiar man lurks through the halls with a cloaked figure in tow—a sayabito who’s been waiting to strike its predecessor…