Actually, the title is intentionally vague to avoid spoilers for people who haven't played the game.
Cawlin gave me a letter to deliver to Karane. However, I also have the option of delivering it to the mysterious ghostly hand in the Restroom.
What do I gain from choosing the former over the latter?
Best Answer
As far as I can tell, you gain nothing from doing these "quests" except 5 Gratitude Crystals and some changes to characters that doesn't seem to affect the story.
I tried both options and here's what happens for both:
(I forgot the exact details on some parts but I'll outline the decisions I made and what happened as best as I can)
My first run I gave it to the "voice coming from the bathroom."
Giving the letter to Karane, a number of things happened...