2Lt. Amethys operates within the Seirēn Federation military as an intelligence officer. Her duties encompass gathering strategic intelligence and supporting operations targeting adversaries such as the Earth Federation. She reports to higher-ranking officers, including Major Rikiyard, within the Seirēn command structure. Amethys's role functions amidst the renewed conflict between the Seirēn Federation and Earth Federation forces, a proxy war ignited by the rediscovery of the space battleship Yamato and the struggle over ancient civilization technology.