The events of Ninjala take place in the 20th century, after the Meiji Restoration scattered Japan's ninja across the country. Over time, the ninja's bloodline diluted as they intermarried with other clans, and they gradually faded into obscurity. However, their descendants formed the World Ninja Association (WNA) to preserve their heritage, which led to the development of Ninja-Gum, an art that harnesses the strength of the Shinobi. The Ninjala Tournament was established to identify the strongest ninja, who would possess the most potent ninja DNA needed to create the most powerful Ninja-Gum.