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.

Lady Ninja: A Blue Shadow

Kamagasaki is an "invisible" slum of Osaka that attracts day laborers and prostitutes since WW2. When the local gang has its treasured cauldron stolen, a war to find it begins involving the thugs, a 12 years old kid, a prostitute and a pickpocket, including the giant cauldron used to feed the destitute: The symbol of Kamagasaki.