She’s a Sickly Villainess, but Her Fiancée is So Overprotective that She Wants to Run Away

The protagonist, a corporate slave in her previous life, is reincarnated as the villainous young lady Fiona, living a leisurely, slow life…or so she thought. But Fiona's frail body is not even in the official character's character profile! Now I understand. Why was Fiona the villainous young lady in the game? She was so sick that she had no choice but to take it out on others…