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.

I got my favorite character (a handsome knight) in exchange for breaking off my engagement...? Sonia is a witch who has been reincarnated as the Last Boss of an anime. She knows that she will be defeated as an evil witch in the future. Wanting to leave the story, Sonia accepts to break off her engagement to the prince, which leads to her downfall. In return, she succeeds in acquiring her favorite knight, Ville, as her squire. Sonia hopes to live peacefully in her hometown with Ville, who had originally been her double, however, Ville hates witches and is always rebelling against her...? The "Last Boss Witch," defying her strange destiny, begins her heroic march!