In the Known World, the storied histories of Essos and Westeros have birthed many songs. Prophecies in every religion come from a commonality. R'hyllor, The Seven, The Old Gods, in the beginning, all the magic in the world stemmed from one being. This being traveled across both continents, sharing its magic with all creatures. Preluding even the Age of Heroes, the progenitor had two children, with wills so powerful, their spirits would burn for endless lifetimes, reincarnating again and again over the epochs. One through individual strength, one through unity. Indra and Ashura.
Azor Ahai was not the first of these reincarnates, nor will they be the last. As the progenitor's comet appears again, the next incarnates will rise. Day and Night. Fire and Ice. Dragon and Wolf.
TLDR: A crackfic where the stories of Jon and Dany parallel lore from a popular anime, in the style of ASoIaF