A demon from the underworld possessed a human?!

Bella, the ruler of the underworld and a demon, ends up inhabiting the body of Isabella Dunkeld, a woman hated by her family and labeled a villainess by everyone.
‘How on earth did I end up in this body?’
She has no memory of making a contract with the human Isabella, yet when she comes to her senses, she finds herself trapped in Isabella’s body with all her powers sealed away.
She decides, for now, to act like a “human.”

“So, with these hands… how many people have I killed? Hundreds? Thousands?”
“Uh… you haven’t killed a single person.”
“I’m called a villainess without having killed even one person?”

For the demon Bella, humans are truly difficult to understand…