The Heroines Who Tried to Behead Me Are Going Mad Trying to Save Me

I possessed the body of a scumbag villain fated to be executed after tormenting the original heroine. Worse, this body is terminally ill—using mana or even getting stressed makes me cough blood—and if the heroine is assassinated, the world ends and I die with it. So when I instinctively took a poisoned dagger meant for her, my purely selfish declaration of survival was somehow mistaken for a noble sacrifice to save the world. Now the heroines who once wanted my head are willing to destroy everything just to keep me alive.