In the book of secrets, which part of the target to be aimed at in different shooting ranges is shown with illustrations; various 'shooting postures' for different purposes, how to distribute power of each part of the body in each shooting posture, and how to take a breath are also described; the desirable state of mind at sighting a target is expressed with a skillful metaphor as Kanya bunso (mental concentration that one can even sense the frosts coming in a winter night).
射距離によって標的のどの部分を狙うか、伝書に図入りで示され、目的に応じた各種の「射撃姿勢」が描かれ，各据銃姿勢による体の各部位の力の配分や、息遣い、また、「寒夜聞霜（照準時の心持として寒夜に霜を聞くことができるような精神統一）」等を名言として伝えた。