The Demon Lord Satan's Wife

[Cover photo isn't mine. Credits to the rightful owner.] She's a highschool girl who receives unfair treatments from her surroundings. She was weak and too coward. At the night of her half sister's birthday party, she was shot by an unknown person and died. But she came back alive with the help of Satan, who inserts her the powerful red-blooded ring that shows an enormous power of a Demon Lord's Wife. She was moved to the Ghost's realm and became their new Demon Lady. She's entitled as the 'VENGEFUL SPIRIT' which she receives from avenging the deceased's injustice death. And also, for revenging those people who made her suffered.