In the 1920s, Japan faces a demonic threat, prompting the government to create steam-powered robot armor suits. Only young women with a unique blend of virtue and courage can operate these machines effectively. Sakura, a girl from the countryside, ventures to the Imperial Capital to join the Imperial Flower Combat Troop. While she possesses the necessary skills to pilot a robot, she is surprised to discover that the Defense Force operates under the guise of a musical theatre troupe. Immersed in a world of elaborate costumes and dramatic performances, Sakura must navigate her dual roles, mastering both acting and robot combat to protect her nation.