Akuyaku Reijou nano de Last Boss wo Kattemimashita

Aileen's life is turned upside down when her engagement with the crown prince, Cedric, is broken off. But when she regains memories of her past life, she discovers she was the villainess of an otome game. To avoid her inevitable death in the end, Aileen must win the heart of the game's last boss, Claude—the infamous Demon King and Cedric's half-brother.

Claude, however, is prone to skepticism when it comes to Aileen. Undaunted, she is determined to help him fulfill his dream of getting along with humanity and the demonic beasts. With her life and Claude's future on the line, Aileen must act fast to avert the tragedy that awaits them both.