Hyakki Yagyà  (, "Night Parade of One Hundred Demons"), also transliterated Hyakki Yakà Â, is an idiom in Japanese folklore. Sometimes an orderly procession, other times a riot, it refers to a parade of thousands of supernatural creatures known as oni and yà Âkai that march through the streets of Japan at night. As a terrifying eruption of the supernatural into the real world, it is similar (though not precisely equivalent) to the concept of in English.
Over more than one thousand years of history, and its role as a popular theme in traditional storytelling and art, a great deal of folklore has developed around the concept, making it difficult if not impossible to isolate any canonical meanings.
One legend of recent vintage states that "every year the yà Âkai Nurarihyon, will lead all of the yà Âkai through the streets of Japan during summer nights." Anyone who comes across the procession would perish or be spirited away by the yà Âkai, unless protected by exorcism scrolls handwritten by Onmyà Âji spell-casters. It is said that only an onmyà Âji clan head is strong enough to pass Nurarihyon's Hyakki Yagyà  unharmed.
According to another account in the Shà «gaishà  (æ¾èÂ¥æÂÂ), a medieval Japanese encyclopedia, the only way to be kept safe from the night parade if it were to come by your house is to stay inside on the specific nights associated with the Chinese zodiac or to chant the magic spell: "KA-TA-SHI-HA-YA, E-KA-SE-NI-KU-RI-NI, TA-ME-RU-SA-KE, TE-E-HI, A-SHI-E-HI, WA-RE-SHI-KO-NI-KE-RI" (ã«ã¿ã·ãÂÂã¤, ã¨ã«ãÂȋÂÂã¯ãªãÂÂ, ã¿ã¡ã«ãµã±, ãÂÂã¨ãÂÂ, ã¢ã·ã¨ãÂÂ, ã¯ã‹·ã³ãÂÂã±ãª).
The Hyakki Yagyà  has appeared in several tales collected by Japanese folklorists.
The night parade was a popular theme in Japanese visual art.
One of the oldest and most famous examples is the 16th-century handscroll Hyakki Yagyà  Zu (ç¾鬼å¤Âè¡Âå³), erroneously attributed to Tosa Mitsunobu, located in the Shinju-an of Daitoku-ji, Kyoto. For other picture scrolls, the Hyakki Yagyà  Emaki (ç¾鬼å¤Âè¡Â絵巻), contains the details of each member in the parade from the Muromachi period.
Other notable works in this motif include those by Toriyama Sekien (Gazu Hyakki Yagyà Â) and Utagawa Yoshiiku. However, Toriyama's work presents yà Âkai in separate, encyclopedic entries rather than assembled in a parade, while Utagawa's Kokkei Wanisshi-ki ("Comical Record of Japanese History," æ»Â稽åÂÂæÂ¥å²è¨Â) employs the theme of 100 demons to comment on contemporary Japanese military actions in China.