The Villainess Will Not Lose

After reincarnating as the villainess of a story, the protagonist realizes a massive change to the original plot: instead of being a tenacious, unkillable rival, she is now afflicted with a fictional, incurable disease. Physically too weak to even attempt bullying the heroine, she focuses all her limited energy on merely surviving her school days while constantly coughing up blood. Despite her grim health condition, her daily struggles to stay alive turn into a bizarre comedy that completely derails the original scenario. (Note: This story contains comedic depictions of a fictional illness and blood-spitting.)