Yuzuriha Koyuki

Osamu Takahashi, who died in an accident, was reborn as Isaac, the second son of the Marquis Welrod family, in a different world of a romance game. However, he is bullied by his brother-in-law, and his first love already has a fiancée... Realizing that he is in a difficult environment even in another world, he makes a decision. "You're in a good position, give it to me!"

Sophia is a "bratty young lady" who loves herself very much. One day at school, she meets her ideal prince, Vincent, and falls in love with him. After a fierce appeal, she steals the position of fiancé from the Marquis' daughter, and smooth sailing awaits her... or so she thought. However, after hitting her head hard, memories from her past life are revived... and she realizes that she is the "bratty young lady" she hates so much! She hates women who seduce other people's lovers just because they're cute, and the men who are seduced by them!! It seems that the same goes for the people around her, and everyone looks down on both me and the Crown Prince. Well, what's done can't be helped. I struggle to somehow improve the Crown Prince's reputation, restore my relationship with the Marquis' daughter, and make a peaceful exit, but...!?