The Koga Ninja were a group of covert agents in feudal Japan, known for their skills in espionage, guerrilla warfare, and stealth. Originating from the Koga region in Shiga Prefecture, they were often rivals of the more famous Iga Ninja. Koga Ninja utilized various techniques, including disguise, deception, and the use of specialized weapons. These ninjas played a significant role in the political landscape of their time, often serving samurai clans. Their training included martial arts, survival skills, and the art of infiltration. Today, the legacy of the Koga Ninja continues to influence popular culture and martial arts.