There's no way that after only 18 months would all the tissue, muscles and organs have decayed completely (maybe eaten though). But still, the bones wouldn't get that fragile? And just wither away? No that seems ridiculous. Great story but last part a little unrealistic.
Hope you don't mind foreign songs, because if u do, you would really miss something so warm and heartbreaking.
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Edit: here it is http://m.funsubstance.com/fun/163979/shinee-quasimodo-beautiful-song-inspired-by-the-hunchback-of-notredame/?ref=submit
Eng subs :) Check it out (◕‿◕✿)