: Covers the lineage of the various Ryu-ha (schools) over which Tanemura holds grandmastership, including Iga Ryu Ninpo and Gyokko Ryu Kosshi-jutsu. preowned physical copy, or Ninpo Secrets by Shoto Tanemura PDF - Scribd
– The work was originally released by Kokuryū Press (a small, Japan‑based publisher). Their website occasionally offers a print‑on‑demand version for a modest fee.
Beyond his martial arts mastery, Tanemura is also a retired police officer who majored in law at Hosei University and later served as an instructor at the Tokyo Metropolitan Police Academy. This law enforcement background grounds his martial philosophy in real-world effectiveness, which is a key theme of the book.