What is the story of the slit-mouthed woman?

The Slit-Mouthed Woman, or "Kuchisake-onna," is a Japanese urban legend about a disfigured woman who wears a surgical mask. According to the tale, she approaches individuals, asking if they find her beautiful; if they say yes, she reveals her grotesque slit mouth and asks the same question again. If the answer is no, she kills them, and if they say yes again, she may attack them or leave them in fear. The legend serves as a cautionary tale about beauty and the consequences of deceit.