Last Boss Majo wa Zensei no Momoe wo Kaikorosu

Sonia Carnelian is the only daughter of the Witch of Salvation. However, during the wedding ceremony that was done in accordance with the treaty, the Prince breaks their engagement, and she is condemned as an evil witch.

“In the original work, ‘the last boss’ will get angry, but I’m not that s*upid.” ― Sonia escapes the crisis with the knowledge of “anime” gained by peering through the previous life. And she gets the Prince’s Knight in exchange for the insult.