The Secrets of Koga-ryu Ninjutsu Paperback – 8 Oct. 2019

Just finished reading this excellent book from Don Roley about sadly, an art that doesn't exist anymore, it's a fantastic book, full of information and insights, especially about the last soke of the art, it's a shame he died before he was able to pass on his knowledge, as I said, an excellent read👍

not the best book on ninja