Yokai are a class of supernatural monsters in Japanese folklore. Yokai have attracted the artists and have been a common theme in art works until these days because of their unique forms and their mysterious behaviours. This book is a visual collection of art works of Yokai in Japan since the Edo period (1603 - 1868). The works are not only paintings but also wood block prints, ceramics, kimonos, children's playthings such as board games, and more. All items that are featured in the book come from personal collections by Koichi Yumoto, who has the largest Yokai art collection in Japan.