As I said in my review: this is a re-imagining of the first Trails game. It’s part of a much, much larger saga that continues to this day—but this is a self-contained game.

You don’t have to wait for the rest of the games. The sequels have already been released.

Think of this like Final Fantasy VII Remake. Final Fantasy VII already exists, and you can buy it for cheaper. And, well, same deal with Trails in the Sky.