Mary dies. Mary is reborn. Mary becomes Adelia Henrietta Bellville, daughter of Archduke Bellville, a villainess of [Regalis: in search of Love!] and probably the most hated character in the otoge community from Mary's time. But she's fine—she read the novels. Many novels.

But here's the thing; all she has to do to avoid her Bad End is to be a decent person. It's what comes after that makes her want to scream in frustration.

Or: that typical Otome Isekai where everyone falls in love with the Villainess, except there's a twist: MC is actually smart, and the characters surrounding her are more than one-dimensional props. And there's an underlying mystery in which her mother is involved that may or may not shake the known world to its core.