Sato Satoru was a children’s author from Yokosuka, Kanagawa Prefecture, known as one of the pioneers of Japanese fantasy for children.
His 1959 book Daremo Shiranai Chiisana Kuni (The Land Nobody Knows) depicts friendship between a boy and little people based on the Korpokkur of Ainu legend, and it became a series known as the “Korobokkuru stories.” Through this work, the little people became beloved by children throughout Japan.