The book's top priority is 'Seishin' (rectifying the mind) and the book includes volumes of Seishin, Shochi, Yonin, Innin, Tenji, Ninki (about ninja's tools such as well-known mizugumo (a water crossing device used by ninja)) and others as well as the description of 'Innin no jozu juichi nin' (eleven experts of ninja art).
｢正心」を第一においており、正心篇・將知篇・陽忍篇・陰忍篇・天時篇・忍器篇(有名な水蜘蛛など忍器について）などや「陰人ノ上手十一人」の記述もある。