Sakura Wars the Novel: Hizakura Season

In 1938, the world is at peace following the Great Demon War eight years earlier and the Shanghai Combat Revue now protects Tokyo. However, Sumire Kanzaki, a retired actress and original member of the Imperial Combat Revue's Flower Division, senses that the demons are about to threaten Tokyo once again. So, she decides to establish a new Imperial Combat Revue and personally recruit some potential members.

(Source: TV Tropes)