|Book(s)||Konjaku Hyakki Shūi|
During the Edo period, a popular summertime activity among the aristocratic classes was to gather and tell ghost stories, hoping the chill of fear would stave off the intense midsummer heat. These ghost story telling parties were called hyakumonogatari kaidankai – a gathering of one hundred ghost stories. During these gatherings, one hundred candles would be lit and placed inside of blue paper lanterns, called andon, in order to create an eerie atmosphere suitable for storytelling. Throughout the night, guests would take turns telling progressively scarier stories about yokai, demons, ghosts, and other strange things. After each story, one candle would be snuffed out, until finally only the hundredth candle remained, its dim blue light casting long, creepy shadows, struggling to fill the dark room.
According to superstition, as the final candle was snuffed, a real ghost would appear out of the darkness to attack the participants, created out of the heightened emotional state and fears of guests. This ghost was called the ao andon.
The ao andon is the incarnation of mass human terror, formed out of the built-up fears of large groups of people. This fear takes the appearance of a demonic woman with long black hair, blue skin, blackened teeth, sharp claws, and horns. It wears a white or blue kimono, and glows with an eerie blue light.
The ao andon appears at the end of the gathering, when all of the lanterns have been snuffed out. It emerges from the smoke of the final candle and attacks the guests. What exactly it does is a mystery; whether it slaughters all of the participants in a brutal finale inspired by the preceding tales, or simply jumps out to give one last shock before the guests return home has never been recorded. The reason for this is that by the time the ninety-ninth ghost story had been told, the guests were usually too frightened to tell the final story, and the parties usually concluded at that point, before the ao andon could appear.
As the old proverb says (in both English and Japanese): speak of the devil, and the devil shall appear. It was feared that merely talking about ghosts and spirits for long enough would cause them to materialize for real.
- Ao andon on Yokai.com