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Futakuchi-onna (二口女) is an antagonist to Kitaro. Her skin is a pale white with raven black hair which can form snake-like ropes that stretch out and snare victims, often to pull them towards her horrifically large mouth on the back of her head which has sharp teeth. She is also known to work with other Yōkai antagonists Kamaitachi and Tantanbō.
In Japanese mythology and folklore, the futakuchi-onna belongs to the same class of stories as the rokurokubi, kuchisake-onna and the yama-uba, women afflicted with a curse or supernatural disease that transforms them into yōkai.
One legend tells of how the futakuchi-onna came to be is long ago a wicked stepmother who always gave plenty of food to her own daughter, but never enough to her stepdaughter. Gradually the stepdaughter grew sicker and sicker, until she starved to death. Forty-nine days later, the wicked stepmother was afflicted with a terrible headache. The back of her head split open, and lips, teeth, and a tongue formed. The new mouth ached with debilitating pain until it was fed, and it shrieked in the voice of the dead stepdaughter. From then on the stepmother always had to feed both of her mouths, and always felt the hunger pangs of the stepdaughter she murdered.