During the several years between 49 to 54 years old, Atsutane researched Koki (Ancient records) literatures of China and India; moreover he researched about existence of sennin (immortal mountain wizard) and god in foreign countries.
49歳から54歳までの数年間、支那や印度の古記文献の研究をし、さらに異国に於ける仙人や神の存在についての研究をして行く。