The discovery of Cavorite in the early 1900s had far-reaching consequences, resulting in the development of advanced military technology and subsequent chaos. Presently, London is partitioned by a wall, and the Kingdom and Commonwealth of Albion are clandestinely battling through espionage. A troop of girls from the esteemed Queen's Mayfaire institution carry out covert missions as spies for the Commonwealth, led by the resolute master driver, Dorothy. The group comprises sharpshooter and shrewd strategist Ange le Carré, proficient samurai Chise, and vocal mimicry expert Beatrice. They employ their exceptional abilities to maneuver a convoluted world abundant with treachery, secrecy, and infiltration. Despite the all-encompassing gloom of the conflict, their ultimate goal remains to execute their mission.