The term Japanese Assassin can be summarized as a NINJA, which is a five-letter word. A NINJA was a covert agent or mercenary in feudal Japan who specialized in unorthodox warfare. They were trained in the martial arts of ninjutsu and used a variety of weapons and tools to accomplish their missions. Ninjas were also known for their stealth and ability to blend into the shadows. They were often employed by samurai warlords to carry out assassinations, espionage, sabotage, and other forms of covert operations.