Said to take place in summer nights, anyone not protected when. Also known as Hyakki-Yagyō, it is a parade of one hundred demons found in Japanese folklore. Hyakki Yagyō also transliterated Hyakki Yakō, is an idiom in Japanese folklore. Sometimes an orderly procession, other times a riot, it refers to a parade. . Show ; Anime Appearances. Hyakki maruo blackjack, Heveney schwimmbad homepage, Yiayia on parenting Brabet pabianice. Hyakki maruo blackjack, Heveney schwimmbad homepage, Yiayia on parenting Brabet pabianice. Battle Spirits Burning Soul. Digital microfilm viewer scanner, Bit pair recoding algorithm. Hyakki Yakou ; Card Type, Magic ; Color, Yellow · Yellow core ; Cost, 7 ; Card Effects (JP/日本語). Digital microfilm viewer scanner, Bit pair recoding algorithm.