. Hyakki Yako. Inspirational designs, illustrations, and graphic elements from the world's best designers. In this concept EP, five. Want more inspiration? Browse our search results. Visitors are welcome to participate in costume and pose for photos by the castle. About this album In Japanese folklore, "Hyakki Yako (百鬼夜行, ひゃっきやぎょう) " means "Night Parade of One Hundred Demons". A Japanese-style Halloween event around Kakegawa Castle.