[SPOILERS]
Okay, I have a theory. So, for anyone who knows the Ruby subplot in cut strings. What if Ruby is the half blood Linne mentions at the end of the intro. for example, the comment about being half-blood. She's the only other character that has as much influence as Linne, because she only appears in hidden events. For example, she appears in the scene with the scent of lemon in Juan's Keep. It would make sense given shes the only character that refers to us by the name we input during Linne's Garden scene.
Other than that, I can only guess that Linne is a god. Or a godlike person who knows more than we do. It seems like the world is a time loop but I'm not sure how that relates to the current plot, if there is a plot at all. This game is good at making people think it has no plot unless you put the details together.
There are so many places that we only hear about briefly. We don't even know where Malbec is! What is the Ebon Sultanate? What's the point of mentioning Ortna? Is it just Japan? We only see a small part of the world, and while I love it, I wish we could go back to an area every week. I want to see all the places we know about through passing dialog.