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From ZeroWiki

Associated with disappearances and spirited aways, there is an urban legend called "The Woman who Crawls on All Fours".

"In close, dark spaces like under the floor, or in the ceiling or closet, lurks a woman that crawls out every night, cursing bitterly."

That's the gist of it.

Many urban legends of this type are based in fiction (novels, etc.) and real incidents.

As the story spreads, images people fear are added and it becomes all the more "legendized".

For example, the story "The Woman who Crawls on All Fours" is said to be based on the following disaster that actually occurred years ago.

"One month after the disaster, a woman's corpse was found in a ditch several miles from the disaster site.
Evidence showed she was alive up to a few hours before she was found."

It is thought to be an exaggeration since the story became "legendized", but several people who lived where the woman was found along the route to the disaster site say they heard a knocking sound in the night.

There is also another version of this story that has been passed on.

The part about the woman lurking in the floor or the ceiling, seeking help every night, is the same. But in this one, the ending is that if you peer into the ceiling or floor, she will attack you.