Sickly girl with no friends slowly dies out because of ancient curse
Girl becomes sickly and slowly dies out because she is a reincarnated spirit of a fox.
Girl becomes sickly and slowly fades out because she is a ghost.
It's not like someone took the most dramatic thing they could come up with (someone you love SLOWLY dying in front of you while you can do nothing), and rehashed it multiple times in the most unoriginal way possible. It's not like they're practically begging you to cry to the drawn out death of characters with no developement other than being cute and having speech quirks.
This should be more than enough logic than a Key thread deserves.