To understand the importance of this translation, one must first understand the source material. The Shōninki (Japanese: 正 忍 記), meaning "True Path of the Ninja" or "Correct Ninja Record," was written in . Natori was a high-ranking samurai and a senior retainer of the Kishū branch of the Tokugawa clan, one of the most powerful families in Japan. His father was the head of undercover military operations for the clan, and Natori himself rose to a significant position, publishing his manual based on his family’s military teachings.

: Cummins and Minami collaborated with Dr. Nakashima Atsumi, a specialist in medieval Japanese documents, to ensure the English text remains as faithful as possible to the original nuances of the scrolls. Core Tenets and Philosophies

Unlike the action-packed portrayals in movies, the Shoninki is a practical guide to the real-world skills of a shinobi (the actual Japanese term for a ninja), presenting all facets of the art of concealment, espionage, and survival. It details methods for disguising oneself, surviving in the wilderness, and even reading faces, but it also delves into the spiritual discipline and magical traditions that distinguished the ninja from the samurai, revealing a profound connection to the yamabushi warrior monks.

Information regarding specific chapters of the Shoninki or other historical ninja manuals like the Bansenshukai can be provided upon request.