Core Themes and Content

The book is less of a “how-to” for combat and more of a scholarly encyclopedia that documents the reality of ninjutsu as a strategic system of intelligence, psychological warfare, and survival.

• Historical Analysis: Fujita provides a deep dive into the three most famous ninja scrolls: the Bansenshukai, Shoninki, and Ninpiden. He analyzes their origins and explains the philosophy behind them.
• The “Internal” Ninja (Yo-nin): A significant portion focuses on “bright” or “open” ninjutsu—using social standing, psychology, and disguise to gather information without ever having to sneak into a building.
• Specialized Tools & Weapons: Fujita details the construction and use of actual historical equipment, including:
• Metsubishi: Blinding powders and their chemical compositions.
• Shurikenjutsu: The physics and tactical use of throwing blades.
• Infiltration Tools: Devices for climbing (kaginawa) and crossing water.
• Mental & Physical Discipline: The text covers Kuji-kiri (hand seals) and meditative techniques used for mental focus, alongside “superhuman” physical feats like joint dislocation and endurance training.