When a mysterious loner and Karate master Kenji's little sister goes missing in Los Angeles, whoever stands in his way of finding her will face the wrath of a lethal KARATE KILL!

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.

A quartet of cute idol singers moonlight as butt-kicking action heroines. When extraterrestrial invaders threaten the safety of the Earth, after an earthquake unleashes them from an alternate dimension, the Danger Dolls become humanity's only hope for survival. The team infiltrates the evil cult behind the invasion and must use their swords and their fists to smash the invading army.