Byoujaku na Akuyaku Reijou desu ga, Konyakusha ga Kahogo sugite Nigedashitai (Watashitachi Kenen no Naka deshita yo ne!?) summary:
A corporate slave in her previous life, our protagonist finds herself reincarnated as Fiona, the villainous noble lady in an otome game she used to play. Finally, this is her chance at a leisurely life... but it turns out that Fiona is actually quite sickly and weak. Hey, this was not in the original setting!! But now, everything makes much more sense. Clearly Fiona was a villainess in the original game because she was always unwell and ended up taking her frustrations out on others...
If things continue like this, Fiona won't be able to live a leisurely, slow life! In order to improve her health, she changes her lifestyle and attitude, but as soon as her fiancé Louis, who had always been hostile to her, finds out about her situation, he becomes super overprotective. Why does he have to start doting on Fiona now?!
"Breaking off the engagement? There's no way I'd do that."
"From now on, you can ask me for anything. I'll make it happen. whatever it is."
It's too sweet compared to the original...!