Want more inspiration? Browse our search results. In this concept EP, five. Hyakki Yako. . Inspirational designs, illustrations, and graphic elements from the world's best designers. A Japanese-style Halloween event around Kakegawa 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". Visitors are welcome to participate in costume and pose for photos by the castle.