A high school recluse unexpectedly lands a life-changing part-time job, taking on the role of a contemporary ninja assigned to carry out international assassination missions.
Following World War II, Allied Command in Japan established a novel agency to tackle terrorism and violence across the Pacific region. This organization recruited ninja operatives, initially for domestic tasks. Over time, the program expanded to its current scope, overseeing a force of 20,000 ninja skilled in various domestic and international operations.
Among these ninja is Kudo, a seventeen-year-old loner from high school who now finds himself at the forefront of defense against a potential influx of foreign assassins infiltrating Tokyo.