Ninja usually immediately associated with a skilled martial figure, a mysterious infiltrate and versatile as they appear in the movie or manga. In fact, the appearance of black ninja has a point, but if it was thought that the ninja is identical to a brutal killer, cold-blooded, a troublemaker, artisans sabotage, not the case. The word ninja is formed from two words namely nin and sha, each of which is a hidden meaning, and people. So the ninja is a professional spies in feudal Japan era. History of the ninja is also very difficult to track. Info about the existence of their meetings stored in the secret documents.