Otome Game wa Shuuyrou Shimashita

Aletta, the daughter of a viscount, was a Japanese high school girl during her previous life. Now, she enjoys living in an unfamiliar world in a slightly unusual family environment. One day, at the school party she attended, the villainess' condemnation event broke out! Seeing this, Aletta realizes that this is the world of the otome game she played in her previous life. However, the heroine is frightened, and as for the villainess, who is sentenced to exile, a development that was not in the original scenario occurs; Aletta's fiancé rushes to join the villainess! With the venue in an uproar, Aletta reaches her limit and collapses. As a result, Aletta's "militant" family goes mad, causing an uproar throughout the entire country! A thrilling fantasy in which a brawny background character tries to clean up the aftereffects in a world after the scenario collapses. (Source: AlphaPolis, translated)