Not sure I can accurately describe why this is so beautiful. It has the potential to be some sort of wish fulfillment fantasy, but it’s not. It has the potential to be a melodrama, but it’s not. It has the potential to be a true tragedy, but it’s not.
The concept could have gone in so many more typical directions, but instead it maintains a calm sort of nostalgia tinged with both hope and melancholy.
The series chronicles the existence of a girl who has to watch the world pass around her forever. She can’t live with other near-immortals, because elves are practically extinct. She has trouble with humans, because for her their entire lifespan is just a moment. She has to watch those she cares about die peacefully of old age again and again, yet for her, this is simply the way of the world, and so she doesn’t break down tragically. She just has to continue on, as the world moves around her.