Nurarihyon no Hanayome

Nurarihyon no Hanayome is a Japanese-style fantasy romance featuring Tsukiyo, a lonely girl who works in the red-light district. She has a burn scar on her face which she covers with a mask. Holding dear the memories of her late mother, she has soldiered on, facing each day after another. One day, a mysterious man suddenly chooses Tsukiyo. He is a youkai king named Oboro, who says he is looking for a stone to become a complete youkai. Oboro seems to think that Tsukiyo may have the stone... "Be my wife and stay by my side." (Source: Hakusensha, translated)