Megaultraspicy's Manga

Reborn as the victim of a mystery novel, she uses her knowledge to blackmail (& make a contract for a fake marriage) with a duke to avoid her death.

Her mother was an angel that died in childbirth. Her father is a demon that almost killed her. Now she’s being raised by a soft demon king and her mom’s angel friends.

When the real daughter died, the parents discovered her- a replica of their dead child. She was tormented by her brothers but is now reborn and changing the fate to be loved.