Sekai de Ichiban Kowai Jugyō "Etsuran Chūi!"「Yōkai-gaku」

The secret story of the birth of the famous yokai "Slit-Mouthed Woman" that shook Japan; "Rubber Man" and "Teketeke" - Hikita's frightening experiences with yokai; What is the historical darkness hidden in the traditional Japanese yokai?