Sorry for late upload. I was exhausted about creating melodies after giving up several other drafts. It's quite difficult to fit songs that I love into 15 note music box... But somehow I managed to finish part 5(though its quality is quite poor) and will upload one with all parts combined soon. Let's give parts retouch later :)
Wow! It seems like this melody can be played offline on a 15 note paper strip music box!
All you need to do is: