The “Hashihime” (橋姫) is a mythical youkai that appears in various Japanese texts (Most notably the The Tale of Heike). After her husband left her and married another woman, the jealous and enraged Hashihime prays to the gods for revenge. A priest tells her a way: She has to dress herself in red and paint her face with the same color, her hair arranged with seven loops and crowned with a burning brazier, then spend 21 days under the Uji bridge while holding a metal rod. So deep was her rage and jealousy, that she actually did the entire process, becoming a vengeful youkai driven by jealousy that only appears in the vicinity of bridges that cross over water. She appears to loving couples, threatening to kill them both unless they break up right there and then. There is also a famous Noh Play about this mythological creature.