The story takes place in Liberl Kingdom, 10 years after being invaded by the Erebonian Empire from the north. It is governed by queen Alicia II. Currently, the kingdom thrives off of high technology which is eyed closely by the Erebonian Empire. The main character, Estelle Astray, a young woman newly recruited into the country's Bracer's Guild, a civilian-run peacekeeping organization. She and her adopted brother, Joshua, travel throughout Liberl to become fully fledged Bracers, and in the quest of finding their parents' killer, but happen across a conspiracy to seize control from the queen.