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