Princess Principal (プリンセス プリンシパル, Purinsesu Prinshiparu) is an anime television series produced by Studio 3Hz and Actas. The series is directed by Masaki Tachibana, with scripts written by Ichirō Ōkouchi. It featured character designs by Kouhaku Kuroboshi and Yukie Akiya. The series aired on July 2017. A spin-off game titled Princess Principal Game of Mission is under development.
With the discovery of a mysterious substance called "Cavonite", Albion was able to construct a fleet of airships that made Albion the dominant power in the world. However, after the London Revolution, the country was split between the Kingdom and Commonwealth of Albion.
The "spy action" series follows five girls in 19th century London, a city within the Albion Kingdom divided into east and west by a large wall. The girls serve as undercover spies working for the Commonwealth who are enrolled as students at the prestigious Queen's Mayfair school. The girls make use of their individual abilities to remain active in the underground world of disguise, espionage, infiltration, and car chases.