In March 2020, Japan’s Ministry of Health put a three-legged, scaly, beaked mermaid from 1846 on its official COVID-19 posters. This episode explains how that happened, starting with a glowing object off the coast of Higo province, a town official’s reported encounter, and a cheap woodblock broadsheet called a kawaraban that recorded the creature’s prophecy: six years of good harvests, and protection from disease for anyone shown its picture.

We reveal that the name Amabie may be a chisel slip, a single katakana stroke separating it from the older Amabiko family of prophetic beasts, and follow the creature’s wild mutations into a torso-less ape head with three legs, a four-legged Daruma doll, and a nine-legged monk. Then we uncover the 19th century grift of peddlers selling Amabiko prints for five cents apiece with sightings set in fictitious locations during cholera outbreaks, before an art shop’s tweet in 2020 launched the Amabie Challenge and turned a typo into a global digital amulet.

• How kawaraban broadsheets slipped sensational news past Tokugawa censors
• Why apes, auspicious numbers, and the Shrine Princess shaped the creature’s look
• The 1881 Tokyo newspaper report exposing doomsday sales pitches
• Manga artists, cookies, knitted dolls, and a Twitter bot that fueled the 2020 movement
• What amulets actually cure: not disease, but the feeling of helplessness