Koka ninjas, also known as Koka or Koga ninjas, were a group of covert agents in feudal Japan, primarily active during the 15th to 17th centuries. They originated from the Koka region in Shiga Prefecture and were known for their skills in espionage, guerrilla warfare, and stealth tactics. Unlike the more famous Iga ninjas, Koka ninjas specialized in gathering intelligence and conducting sabotage missions. These ninjas were often hired by samurai and feudal lords for their expertise in infiltration and reconnaissance. Koka ninjas utilized various tools and techniques, including disguises, traps, and secret codes, to accomplish their objectives. Their legacy continues to influence popular culture, contributing to the modern image of ninjas in movies and literature.