Conceals affliction behind ordinary daytime self

Krasue

By day it is said to appear as an ordinary woman, indistinguishable from her neighbors, with the affliction sometimes described as hereditary, passed down through a family line, or acquired through the practice or failure of certain black magic and taboo-breaking.

Rokurokubi

A rokurokubi is usually said to be unaware of its own nature by day, living an apparently normal life and only transforming while asleep, which allows the affliction to go undetected by the person themselves and often by their family as well.