During the Punk Hazard arc, the boy Momonosuke transformed into a dragon. The story of a boy who turned into a dragon sounds really familiar to me for some reason. I believe I might have heard it somewhere before as some sort of tale, or maybe even as a part of some myth. I have been searching quite a bit to find something similar, but I couldn't find anything.
So is the story of Momonosuke, the boy who transformed into a dragon, based on anything?