Enduring extreme hardships is integral to practicing the ancient Japanese art of the ninja. Nine individuals take part in a 24-day survival challenge to find out who has what it takes to consider themselves a true-blue ninja. The challenge includes eight gruelling missions - trekking through a frigid swamp, surviving overnight on an icy glacier, crossing a raging river, escaping imprisonment, and more - created by Jinichi Kawakami, Japan's last ninja grandmaster, which push the wannabe warriors' body, mind and spirit to their breaking points. Those who complete the entire survival challenge receive a final lesson from the master himself in Iga City, Japan, the legendary home of the ninja.