The Duke's Daughter (Kōshaku Reijō No Musume)

Mi is an office worker at the age of 30 years old, despite that, she has never experienced romance. But, after she died, she got reincarnated into Leslie Melline, the daughter of a Grand Duke, and the female lead of the novel “The Crimson Princess Is Actually Nice?” who dies from a horrible fate, thanks to Prince Eldoir. But there's one problem: He likes her!? “I want to be with you for the rest of my life, Leslie,” Eldoir says. Leslie stared down at him and turned away. “Fool! Do you think I’m dumb? I’ll never like or even marry a man like you! You should be ashamed of yourself!” Leslie walked away, proud of herself. She might not be able to get back to her other world, but she is sure about one thing: She will never fall in love with Prince Axuell, no matter how hard it is!