Sekai de Ichiban Kowai Jugyō "Etsuran Chūi!"「Yōkai-gaku」
Original title: 世界で一番怖い授業“閲覧注意！”～「妖怪学」
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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?
