Akuyaku Reijou tte no wa Kou Yaru no yo

The moment she awakens, Lady Cassandra Wendel realizes she has been reincarnated as the villainess from "The Tale of the Saint of Light's Salvation," a book she read in her previous life. If things continue as they are, she is destined to be condemned by the summoned saint and the men who flock to her.
The villainess, who rose to power through wicked means in her previous life, decides to defy the script and condemn them.
"I'll show you what a true villain is!"
The villainess's reversal of fortune begins here

_Source: Gaugau Monster, translated_