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