According to Japanese legends, Kuchisake-Onna (literally ‘the slit-mouthed woman”) was a woman who was suffered facial mutilations—cuts from the corners of her mouth, stretching ear-to-ear in a grotesque smile. Her origins are slightly different depending on the particular version of the legend.

Some say she was the adulterous wife of a samurai who became lonely whilst he was away so she began to have affairs. When her treachery was discovered, he mutilated her for her infidelity.

In other versions, she was mutilated during a medical or dental procedure or by a female rival who was jealous of her beauty.

But all versions are consistent in that the vengeful spirit is exceedingly vain and violent. She covers her mouth with a surgical mask (or in some versions, a Japanese fan or handkerchief) and carries a sharp instrument; usually a knife or large scissors. With supernatural speed, she is hard to evade. It is said that she asks her victims a question, and reacts differently depending on their reply.

“Do you think I’m pretty?” she asks. If the victim answers “no,” she will kill them without hesitation. If the victim answers “yes,” she will remove her mask, revealing her ghastly ‘smile.’

“Even now?” She’ll ask.

If they answer “no,” or if they scream, she kills them.

If they reply “yes,” she takes her weapon and slices her victim’s mouth, mutilating them, as she was.

There is some debate, depending on which legend you hear, as to how to escape her. In one version, one must simply answer “yes” to both questions; although in some variants of this, she then follows the victim home and slaughters them while they sleep. Others maintain that one must confuse her, either by replying ambiguously, like “so-so,” or “meh,’ giving them enough time to run away (without being followed).

Or you could confuse her by throwing hard-candies (known as bekko-ame) at her or by saying “pomade” three times (both a bit odd, I know. I have no insight as to why this may be.)

Akamanto, or "red cape", is another urban legend similar to Hanako which (oddly enough) centers around toilets or bathrooms. 

The general legend begins with someone being in a public restroom to find there's no toilet paper. They then hear a voice ask: 

"Red or Blue?"

The ending differs depending on the person's answer. If you choose red, the spirit known as Akamanto ("red cape") or Akagami ("red paper") will come forth and tear the skin off your back so it hangs down like a red cape. 

If you choose blue, the spirit will either bleed you dry so your skin turns blue, or string you up from a noose and strangle you until your lips turn blue (charming legend, eh?)

This will be more of a thriller/horror involving the yakuza and the dark, dangerous underbelly of Japanese night life; with supernatural elements towards the end, since it's an origin story for the above legend.