During the early 20th century, the discovery of Cavorite led to the development of advanced military technology which ultimately steered the country towards conflict. Currently, London is divided by a wall and the Kingdom and Commonwealth of Albion are engaged in a silent war where espionage is the only weapon that can destabilize the enemy. A group of girls from Queens Mayfaire school have been tasked with working as undercover spies for the Commonwealth. Led by Dorothy, an experienced driver with a striking personality, this team includes Ange le Carré, a cold-blooded liar and expert sharpshooter; Chise, a proficient samurai; and Beatrice, a voice-mimicking specialist. They use their unique individual skills to survive in a world filled with conspiracy, mystery, and infiltration. Their sole goal is to complete their mission in the shadow of this ongoing war.