Fight everyone and trust no one: it's the code of survival practiced by martial-arts master Casey Bowman after his life of domestic bliss is shattered by a savage act of violence. Vowing revenge, the fearless American stealthily tracks the killer from Osaka to Bangkok to Rangoon with the help of a wise and crafty sensei. His only clues: a series of victims whose necks bear the distinctive mark of strangulation by barbed wire. Fighting to avenge as well as to survive, Casey must sharpen his razor-like responses and take his battle skills to the next level, even using deep meditation to fake his own death. His target: the sinister drug lord Goro, who is flooding the streets with deadly meth cooked at his remote jungle factory. To prepare for his ultimate confrontation, Casey must finally become an invisible warrior worthy of the name Ninja. But just when his prey is cornered, an unexpected twist shows Casey that his battle is only beginning: he truly can trust no one.

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 veteran and tough sheriff's wife has a gambling problem. He works both sides of the law. He gets teamed up with a young cop who he is told to take under his wing. They end up working together well and the young cop's martial arts skills are very useful.

Innocent women are being kidnapped by a group of ninja and taken to a secret prison camp where they are forced to work as slave labour. Furthermore, the evil head ninja has ambitions to sell 53 of their number off to a high bidder in the Middle East. All is not lost however, for Jenny, a beautiful female ninja has been hired to infiltrate the camp and rescue Sylvia, one of the captive women there.