So... is Nabari no Ou finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 29, 2008
Manga finished: August 18, 2010
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Nabari no Ou centers around Rokujou Miharu, a seemingly ordinary and detached teenager who unknowingly possesses a hidden and immensely powerful ability called "Shinrabanshou."
This ability makes him a target for various ninja clans vying for control of Nabari, a hidden world within Japan.
Miharu's life is disrupted when he discovers that his classmates and teacher are ninjas sworn to protect him from those who seek to exploit his power.
Despite his initial reluctance, Miharu is drawn into the world of ninjas as he struggles to understand and control his power while navigating the dangerous political landscape of Nabari.
The story follows Miharu as he learns to rely on his protectors and confronts the forces vying for control of him and the Shinrabanshou, ultimately deciding his own destiny within Nabari.