The story is based on the real Yoshiko Kawashima, a female spy who worked for Japan and disguised herself as a man. The story will follow Kawashima during the interwar period of the Taishō era.

The year is 1863 as the tumultuous samurai era is coming to an end, Japan is split between the pro-shogunate and anti-shogunate factions. The fate of the world is threatened as an army of historical revision...