Battle Spirits Burning Soul. 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. Show ; Anime Appearances. Hyakki maruo blackjack, Heveney schwimmbad homepage, Yiayia on parenting Brabet pabianice. 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. Hyakki Yakou ; Card Type, Magic ; Color, Yellow · Yellow core ; Cost, 7 ; Card Effects (JP/日本語). Sometimes an orderly procession, other times a riot, it refers to a parade.