A figure centered on the monstrous crab legend of Chogenji at Manriki in Kai Province. Disguised as an itinerant monk, it comes to the temple at midnight and borrows Zen phrases, tossing hints like “freely side-walking” and “two legs eight legs” to suggest a crab while testing its counterpart’s wit. It retains human form until its identity is pierced, but when pressed with ritual implements or mantras it reveals its carapace and flees, said to span a two-ken square or reach four meters across. Local lore preserves place names like Crab-Chasing Slope and Crab Marsh, a holed “claw-mark” stone, and tales of thrown stones. Across regions the same tale type shares an empty temple, late night, Q and A, exposure of the true form, and retreat or slaying, with the kyogen play “Crab Yamabushi” often cited as an influence. Devotional aftertales may stress the ritual implements used in subduing it—vajra pestles or iron fans—and devotion to Kannon, though details vary. The version told from the Kyoho era onward forms today’s backbone, and a Meiji hanging scroll attests to the tale’s settlement. Stripped of later embellishment, it is a moral tale of a shape-shifting crab that tests a monk and yields to sacred power.