The original storyline, said to be inspired by the Shochiku Revue and Takarazuka Revue, takes place in an alternate 1920s Tokyo. It follows the adventures of an all-female secret task force known as the Imperial Assault Force — Flower Division as they defend the Imperial Capital Tokyo against evil. They are led by Ichiro Ogami, a newly graduated male Imperial Navy Ensign who had been assigned to the squad partly due to his unique ability to use a special type of armor, about which it was previously believed that only women possessing high levels of spiritual powers could operate. The setting eventually moved on to other locations such as Paris and New York.