Introduction to Volume 1: The once flourishing Japanese ninja were forced by GHQ to dismantle their organization after the war and disappeared. In fact, however, ninja still exist in secret, and their number is said to be as many as 200,000. Some elite ninja were active behind the scenes in conflicts at the national level. On the other hand, the ninja at the end of the line are often unable to find work, and one of them, Kuro Kumogakure, was living as if he were a NEET. However, Kuro finally rec...
