Koto Ryu Koppojutsu, is the companion school to Gyokko Ryu Kosshijutsu, The book contains the history and all the known Koppojutsu kata for this Ryuha, as well as a Kyusho chart. The kata content has been cross referenced with original densho belonging to several Japanese Bujinkan sources. The author, Paul Richardson (15th Dan, Daishihan), has been a member of the Bujinkan since 1985, he has travelled extensively in Europe and USA training and teaching, and travels to Japan every year to continue his training and research. .