​Kiyohime as Hannya-faced Serpent by Minkoku Genryosai
Today's netsuke is one of my favorites, despite the damage to Kiyohime's face and arm.  It depicts Kiyohime, transformed into a monstrous serpent with the face of a Hannya demon, coiled around a temple bell.  Visible inside the temple bell is the red face of the priest Anchin.  When the top of the bell is turned, a white-faced Anchin is revealed inside the bell, surrounded by flames.  The netsuke is signed Minkoku and is attributed to the 18th century carver Minkoku Genryosai.  The rotating interior of this netsuke makes it a "trick netsuke".
Here's a summary of the story of Kiyohime, from wikipedia (https://en.wikipedia.org/wiki/Kiyohime):
One day, a handsome visiting priest named Anchin fell in love with the beautiful Kiyohime, but after a time he overcame his passions and refrained from further meetings. Kiyohime became furious at the sudden change of heart and pursued him in rage. The priest and Kiyohime met at the edge of the Hidaka river, where the priest asked a boatman to help him to cross the river, but told him not to let her cross with his boat. When Kiyohime saw that Anchin was escaping her, she jumped into the river and started to swim after him. While swimming in the torrent of the Hidaka river, she transformed into a large serpent or dragon because of her rage. When Anchin saw her coming after him in her monstrous new form, he ran into the temple called Dojo-ji. He asked the priests of Dojoji for help and they hid him under the bell of temple. However, the serpent smelled him hiding inside the bell and started to coil around it. She banged the bell loudly several times with her tail, then gave a great belch of fire that melted the bell. The fire was so great and large that she not only melted the bell but she killed the priest as well.

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