A folkloric image of a nightly procession of monsters, spirits, and yokai—often depicted in Edo-period paintings.
浮世絵には百鬼夜行の場面がしばしば描かれている。
Ukiyo-e often depicts scenes of the hyakki yakō (procession of a hundred demons).
夜道で奇妙な影を見て、思わず百鬼夜行を想像してしまった。
Seeing a strange shadow on the road at night, I couldn't help imagining a hyakki yakō.
Figuratively, a veritable pandemonium; a chaotic throng of people (or sinister characters) acting together, often implying mischief or evil.
ネット掲示板は匿名の書き込みで百鬼夜行のようになっている。
The online forum has become like a hyakki yakō due to anonymous postings.
選挙後、街頭には野次や歓声が入り混じり、百鬼夜行の様相だった。
After the election, the streets were a mix of jeers and cheers—a scene of pandemonium.
そのイベントは管理が行き届かず、百鬼夜行のような騒ぎになった。
The event was poorly managed and turned into a chaotic uproar.