There´s a little mistake.
You wrote, that he obtained the Ocarina of Earth in that dungeon.
But then the female-ghost tells him to search for the Ocarina of Water and Earth.
Well, if thats the case.. Hey Jonathan, look into your pocket! ... Yippie, you've
just found the Ocarina of Earth again! xD
Just kidding. Surely you wanted to write he should search for the Oca of Air und Water.

Well, like the others said, the story isnt groundbreaking, but could be interesting,
if you do a great job.

Good luck!