Tradition / Region: Japanese Mythology
Alternative names: Goi no Hikari (“Night Heron Light”)
Category: Bird
The Myth
The Aosagibi is a mysterious yōkai created when an old heron—most commonly a black-crowned night heron—lives long enough to gain supernatural powers. These transformed birds appear around rivers, marshes, and reed-filled wetlands, especially on cool autumn nights.
As the heron ages, shining scales form upon its breast. With every breath, it exhales a fine yellow powder that drifts through the air. At night, its body glows with a bluish-white radiance, and the powder bursts into floating blue fireballs that drift over rivers, through the trees, or across the night sky.
Although these ghostly flames appear supernatural, they produce no heat and burn nothing they touch. Eventually, they fade away into the wind.
Despite their eerie appearance, Aosagibi are harmless. Like ordinary herons, they remain shy and avoid people, silently disappearing into the darkness when disturbed. Their glowing blue flames are often mistaken for other supernatural lights, but they are simply the strange manifestation of an ancient magical bird.
Sources
Yokai.com. (n.d.). Aosagibi. In Yokai.com: The Illustrated Database of Japanese Folklore. Retrieved June 29, 2026, from https://yokai.com/aosagibi/