I'm the Villainess, So I'm Taming the Final Boss (Simuldub)

During her public denouncement, Aileen Lauren Dautriche suddenly remembers her past life. She's the villainess from an otome game she once played that will die in terrible ways! She must survive! The best way to ensure her survival? Tame the last boss!

After breaking off the engagement, Prince Cedric seizes all of Aileen's businesses. Aileen is in danger of being disowned and becoming a commoner if she doesn't recover the financial losses of the Dautriche family before the ball in two months...

Aileen finds out that Cedric's new fiancée, Lilia Rainworth, has received threatening letters that were signed by herself. Since she has no memory of doing so, she has her friends help her find out the truth.

Aileen finds out that Claude's aide, Keith, has been selling demons. Keith tells Aileen why and reminisces about their past. Now that Aileen knows his feelings, she decides to work with Keith to prevent Claude from despairing and turning into a demon.

Aileen overcame all the difficulties and got engaged with Claude. Just when she thought she found her happily ever after, she receives news that a demon named Ashtarte attacked a human village in the Mirchetta region.

James turns into a demon at a different point from the original game, but Aileen decides he can still revert back and lets him escape. However, the student council member Walt Lizanis witnesses the scene and begins to doubt Aileen's identity.

James is suspicious of Aileen since she knows of his demon form. However, Ribbon's existence and Aileen's words "I want to protect you" softens his heart and he decides to work with her on the case.

Knowing that the prize of the contest for White Lily Princess is demon incense that's harmful to demons, Aileen removes her male disguise and enters the contest dressed as a woman. While others are overwhelmed by her beauty, James asks her to dance.

Aileen and the others infiltrate a black market auction that is trading demon incense. She meets the sorcerer Elephas Levi when she tries to sneak into the host's room.

Claude loses his memory and magical powers, returning him into a normal human being. In order to show the appeal of that aspect to the public, he goes on an inspection of the third zone of the imperial capital.

Aileen and Claude get separated by a misunderstanding. Aileen stubbornly decides she can avoid getting executed if she just dissolves her engagement with Claude and buries herself in work. Soon, she receives a dress from Claude for the upcoming ball.

Aileen falls into the sorcerer's village. While she is imprisoned, she finds out that this is all part of a coup d'état planned by the Levi family and that Lilia instigated their actions. Aileen discovers that Lilia has been serving the empress dowager.