I think it might be the spirit of the stone tower that miae made a wish on!! But that’s only if the spirit theory is true though lol since idk how fantastical aslfua will end up being… But I also like the theory of it being miae from the future and aslfua as a retelling of their love story because that seems super cute hehe … or they could just be a narrator 🤷🏽‍♀️ whos to say…