Under Ninja

Ninjas still exist in Japan today. They number around 200,000. The ninja organization NIN (National Intelligence of NINJA) is not controlled by the civilian government, with its elite members performing assassinations and sabotage in secret. There is an organization that opposes NIN: UN (Under Ninja). Ninja versus ninja: What lies waiting at the end of this shadowy feud?

(Source: Crunchyroll)