Katsuragi Ataka

"I am no longer fit to marry the Crown Prince!" After being poisoned repeatedly by her stepmother, the eccentric noblewoman Belladonna developed a resistance to poisons - so much so that she eventually grew to enjoy eating toxic plants. Through relentless effort, she achieved her dream of becoming a botanist. Just as her career begins to flourish, an unexpected marriage proposal arrives - from none other than the Crown Prince himself! But life as a crown princess would mean abandoning the research she loves. Desperate to escape the engagement, Belladonna hatches a plan: she asks her close friend from the tavern, Will, to help her lose her virginity, hoping to render herself unfit for marriage. On the day of the prince's visit, she prepares to announce that she's no longer a maiden and expects the engagement to be called off. However, the man who appears before her is...!? (Source: MangaPlaza)

Selma is a saint without holy powers. She keeps it a secret, but a man who suspects her - Theophilus, the royal prince's highness, has entered the Order as a believer. On top of that, he finds out that she is not a real saint. ......!

I used to be a driven, hard-working person. And now, in this life, I live as Cinderella's stepsister Petra. Cinderella is a beauty, but also very lazy and sloppy. In the hopes of bringing her and the prince together in marriage just like the fairytale goes, my other sister and I did our best to educate Cinderella. People witnessing mistook our strict ways, and the rumors of "the evil stepsisters" spread around... However, despite the obstacles, we successfully saw Cinderella married off to the prince! Happily ever after!... Or so I thought until I met a mysterious gentleman named Eric. He approached me at the ball just so he could rudely accuse me of bullying Cinderella out of jealousy! Well, he chose the wrong person to pick at because this "evil stepsister" isn't going down without a fight!