Historical Context of This Artifact

This 304-page historical manual is a critical wartime intelligence document compiled by Fujita Seiko, the 14th headmaster of the Koga-ryū Wada-ha tradition and legendary “last true ninja.” Published during the peak of World War II, it serves as an investigative bridge between two distinct eras: the clandestine exploits of the feudal shinobi and the practical, modern field requirements of a 1940s military intelligence officer.

The text structure is split into two halves: a detailed historical breakdown tracing lineages back to the Takeda clan and old Kōga households, followed by a tactical field section updating ancient infiltration strategies into modern wartime contexts.

Key Content & Chapters

• Secrecy and Infiltration: Methods for adapting medieval night-entry and camouflage guidelines into 20th-century concrete urban environments.
• Psychological Warfare: Utilizing tactical deception, misinformation, and behavioral manipulation to distort an enemy commander’s perception.
• Hidden Tools: Shifting from primitive iron climbing hooks to the production of micro-documents concealed inside everyday items like calligraphy brushes.
• Defensive Close Combat: Employing classic non-lethal weapons like the Jutte and Sai for immediate battlefield restraint and subdual.

Rare and Unusual Aspects of the 1943 Printing

Unsanitized Visual Records: Unlike post-war commercial reprints which were heavily sanitized or edited down, this authentic wartime artifact retains its raw, original photographic plates. These show high-resolution, look inside actual hidden-compartment technologies used in the 1940s, offering an unfiltered look at WWII-era spy technology.

The Nakano Spy School Textbook: This volume functioned effectively as an active field textbook for the Nakano Spy School (Rikugun Nakano Gakkō), the elite, secret military academy where Fujita served as a primary instructor. Original printings from 1942–1943 were produced in highly restricted quantities specifically for the war effort and were never intended for open civilian bookstore distribution.

The Scarce Wartime Supplement (1943): This specific copy is the April 20, 1943 Revised Edition. This configuration is significantly rarer than the initial 1942 first printing because it contains updated, “supplemented” tactical materials compiled to meet the changing strategic demands of the Japanese intelligence community as the Pacific War progressed.

Government Censorship Verification: The distinct red circular stamp on the colophon is a rare “mark of the era.” It verifies that the highly sensitive content—despite explicitly dealing with active espionage techniques—was formally reviewed, cleared, and authorized for official publication by the Japanese Imperial government.