The Lady with the Lamp

On the second summer after I was reborn, I decided to marry a dead man. * Aside from the title and the profession the heroine plans to choose, this has nothing to do with the goddess Florence Nightingale. The heroine is a Mary Sue with genuine mental problems. By normal standards, she's a terrible person, but she's also a saint who saves lives. Read with care. Theme: A Mary Sue who's tired of life