Moreover, the appearance of the kutsu yokai is designed based on the picture of a kutsu yokai (shoe specter) drawn in "Hyakki yagyo emaki" ('Night Parade of One Hundred Demons' picture scroll) in the Muromachi period.
また沓の妖怪のデザインは、室町時代の妖怪絵巻『百鬼夜行絵巻』に描かれている沓の妖怪が元になっている。