Ninpo: Wisdom for Life was written by Masaaki Hastumi and available in only Japanese. Hatsumi-soke (headmaster of the Togakure Ryu Ninpo and Director of the International Bujinkan Hombu (Noda, Japan) encouraged this translation and release in the 1999. This book has appoximately 200 pages of ninja philosophy for training and living. ISBN: 0-9727738-0-0 Copyright 1997, 2014. All rights reserved.