Kamikatari ni Sayonara wo

Iroha is a girl who was born into a prestigious family that has worshiped an ayakashi spirit for generations, believing it has brought them great wealth. Iroha has been a good girl who followed the wishes of her parents, but she can see spiritual beings, and she realizes that the spirit is only pretending to be a "god." And when her parents set up an arranged marriage with a much older man, Iroha began to doubt her entire family's environment, and she runs away from home, only to meet a beautiful demon.

(Source: Zero-Sum Online, translated)

Note: Originally a two-chapter short story featured in the anthology あやかし旦那様の愛しの花嫁～お前は永遠に俺のもの～アンソロジーコミック Volume 2, it was picked up for extended serialization.