Kamaitachi

Kamaitachi (鎌鼬^?) is a Japanese yōkai often told about in the Kōshin'etsu region, or can also refer to the strange events that this creature causes.

They appear riding on dust devils, and they cut people using the nails on both their hands that are like sickles. One would receive a sharp wound from it, but there is no pain.

They are seen to be the same as the Qiongqi (窮奇) of China, and kamaitachi are also sometimes written as 窮奇.

It was originally thought to be a corruption of the word "kamae tachi" (stance sword), but like the kyūki in the "Yin" part of Toriyama Sekien's Gazu Hyakki Yagyō, they were thus re-used and depicted as a weasel yōkai, eventually becoming established as the yōkai it is now. In the "Mimibukuro" by Negishi Shizumori as well, children in the estate called Kagaya in Edo were enveloped by a whirlwind, and on the surface of their backs, there remained the footsteps of a beast, and it was written that this was the proof of a "kamae tachi" (構太刀). As a beast with fur like that of a hedgehog and a cry like that of a dog, and one that flies through the air with wings, they are said to attack people with limbs like that of a sickle or razor.

Devilish winds that would cut people are told about in the Chūbu, Kinki, and other regions. There are many legends passed down in snowy regions, and there are some regions that call whirlwinds themselves "kamaitachi." On occasions of cold wind and other times, they are also a strange event of where one would fall over and get an injury on the legs.

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Wikipedia