Originally published in the January 1952 New Year’s Issue of Liberaru (りべらる), this rare autobiographical article by Fujita Seiko (1899–1966), 14th successor of Kōga-ryū Ninjutsu, discusses the origins of ninjutsu, the traditions of Iga and Kōga, historical ninja figures, traditional training methods, espionage techniques, physical conditioning exercises, and Fujita’s personal experiences and research.