Akuyaku Reijou ni Tensei Shita Inaka Musume ga Bad End Kaihi ni Idomu Hanashi: Shinitakunai node Last Boss Yori Tsuyoku Nattemita

After being attacked by monsters, a countryside girl meets an all-too-sudden death, only to wake up and find herself as the villainess of the storybook she loved so much! Originally doomed to live as the main heroine's enemy and die at the hand of the Demon Lord, she suddenly finds the Demon Lord proposing to her, unlocking an uncharted story route...?! With her story knowledge and incredible powers, this villainess is ready to dodge her bad ending and make a legendary comeback in this fantasy tale! (Source: Manga UP!, Global)