In the near future, the economy has collapsed and the country has turned into a ghetto. A secret agency, Gokuraku, has been created by the government. Secret agents Aya and Chinatsu's mission is to fight against one of the largest international companies, Kuroda Group. Secret agents are called 'Lady Ninja', and they use a traditional Japanese umbrella-like tool called 'sangoku' to defeat evil.
The background to and depiction of a watershed battle in Japanese history, at Sekigahara in 1600, when Tokugawa Ieyasu's Army of the East defeated the Army of the West of Ishida Mitsunari. The story includes the intrigues and shifting loyalties of the various retainers, family members, and samurai.
