Ikuchi
Ikuchi is a yōkai of the sea serpent type in Japanese legend. It has been described in a two anecdotes collections during the Edo period, namely (1795) by and (completed 1814) by . Tankai According to Tankai ("Sea of Stories", 1795) by , the is an extremely long fish dwelling in the deep waters off Hitachi Province (now Ibaraki Prefecture). It has only been spotted at night, sometimes rearing out of water and slinking over a ship, taking a long time to complete its passage, and leaving a residue of viscous oil. The sheer amount of oil needs to be dumped overboard lest the ship may sink. It does not have much thickness supposedly, but spans a total length of several hundred jō（several thousand feet), requiring 1 or 2 (1+ or 2+ hours, perhaps little less than 3 hours) to finish hauling its whole length across the ship. Its body oil is said to have the consistency of funori (gummy substance derived from Gloiopeltis seaweed) and slickens the ship's deck so walking back and forth becomes impossible. Thus the ship needs be scrubbed and cleansed thoroughly after a visit by the ikuchi. Mimibukuro In "Mimibukuro" ("Ear bag", 1782–1814) by ,