If you say ninja you die?

Ninja Assassin follows Raizo, one of the deadliest assassins in the world. Taken from the streets as a child, he was transformed into a trained killer by the Ozunu Clan, a secret society whose very existence is considered a myth. But haunted by the merciless execution of his friend by the Clan, Raizo breaks free from them and vanishes. Now he waits, preparing to exact his revenge.

A CIA operative in Hong Kong must become a Ninja in order to retrieve a stolen Top Technical Secret Film from a Clan of Ninjas sent by the KGB.

Steve is a Ninja. He's been called in by the police to help them in their investigations. He's to work with Kevin, a police lieutentant. They are investigating the break-in at the Federal Research Institute, where despite heavy security, 7 Ninja warriors manage to steal a vital document. Well pleased with their night's work, they return to their master, Kurodo, who finds they only have a half of the information they need. The police capatain wants results. Kevin suspects that a Japanese Garden he visited once with Steve could be the headquarters of Kurodo and his Ninja's and goes in search of proof. He's caught spying and is tortured and killed. After the disappearance of Kevin, Steve opens his Ninja box. He breaks the seal of his Katana and starts the Mantra. He attacks the Japanese Garden, eliminates the Ninja warriors and after recovering the documents and blowing up the laboratory, finally meets Kurodo, there can only be one victor...

The once-proud Japanese Ninja disappeared after the war when GHQ disbanded their organization.However, in reality ninjas still exist secretly and it is said that there are 200 thousand of them.And some elite ninjas are secretly operating behind the scenes in national-level struggles.On the other hand, grassroots ninjas often cannot find jobs, and one of them, Yun Yin Jiu Lang, also lives a life similar to that of the NEET generation.However, there is finally a major "endurance" around Ninomaru!

Ninja are now seen in popular media around the world. But as their profile rises, their reality gets muddied amid legends and fantasies. The truth about authentic ninja lies unknown, shrouded in mystery. This program carefully examines the fighting skills and tools used by actual ninja, and conducts experiments to determine the "Ninja Truth".

An organized gang specializing in high ranking military assassinations bewilders the police. However, their headquarters are located and a special agent is sent to terminate all members of the gang.