Yanagita Kunio was the folklorist who founded Japanese folklore studies. After serving as an official in the Ministry of Agriculture and Commerce, he researched and recorded the traditions and customs of villages all over Japan.
The Legends of Tono (1910) collects stories he heard from Sasaki Kizen, a native of the Tono region of Iwate Prefecture, including tales of the kappa, people spirited away, zashiki-warashi and mountain men. In works such as Yokai Dangi, he proposed that yokai were “fallen gods,” laying the foundations of yokai studies in Japan.