Under Ninja (2025) is a Japanese live-action action fantasy adaptation of the manga Under Ninja. In the film, modern ninjas secretly exist in today’s society despite being believed to have disappeared after WWII. The protagonist, Kuro Kumogakure, is a lower-ranked ninja in the ninja organization “NIN” who lives a mundane life until he’s suddenly tasked with investigating a mysterious underground group called “Under Ninja” (UN). As Kuro delves into this secret war, he infiltrates a high school as