The term "Koka ninja" refers to a group of skilled warriors from the Koka region in Japan, known for their expertise in stealth and espionage. These ninjas were part of the broader ninja tradition, which included various clans specializing in different techniques and tactics. Koka ninjas were particularly noted for their agility and ability to blend into their surroundings. Koka ninjas often employed unique strategies and tools, such as shuriken (throwing stars) and smoke bombs, to accomplish their missions. They played significant roles during the Sengoku period, a time of intense military conflict in Japan, where their skills were sought after for reconnaissance and sabotage.