However, from the viewpoint of Japanese history, he wrote "Nihon Yokai Henkashi" (history of change of Japanese yokai), treated yokai academically, and created a general atmosphere for the public to take a renewed look at yokai.
しかし、日本の歴史学の見地から『日本妖怪変化史』を著し、学術的に妖怪を取り上げ、世間に見直させる風潮を作った。