tragic shoujo one-shot

Looking for a oneshot I read years ago on another website, so I'm not even sure its om mangago. I remember clearly it was a long oneshot, maybe 80-90 pages.
My memory is a little sketchy, but I will try to describe it. Spoilerfree description: A girl wakes up in the hospital to see a young man beside her bed. He identifies himself as her uncle and guardian. She is told her parents and boyfriend are gone and he quickly take her home with him to recuperate.