Irekawari Akujo ga Kaerizaku Made

Maria, the daughter of a count, has worked hard since she was a child and won her engagement to the beloved crown prince.
However, the day before the engagement ceremony, she is attacked by an unknown assailant and loses consciousness.
When she wakes up, she finds that her body has been swapped with that of the hated villain Bernadette!
Maria, who found out that Bernadette had taken her body, overcomes her despair and vows to take revenge.
"I'll get everything back. I'll get revenge on Bernadette, and I'll definitely return to being the crown princess!"
This is the start of Maria's tale of revenge from rock bottom, now that she has become the hated "Bernadette".