What is "akashita"

An is a yōkai that appeared in Toriyama Sekien's Gazu Hyakki Yakō. It is drawn as a beast with clawed hands and a hairy face, with most of its body hidden in a black cloud over a floodgate. In its open mouth is a large tongue. Sekien did not attach an explanatory note, so it is not certain whether he intended it as an original creation, but it may be related to the which guards the western gate of Jupiter. It may also be related to the , a day of bad luck in Onmyōdō.