So... is Tribe Nine finished or not?
NO, it is not finished.
Why?
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
In a futuristic Neo-Tokyo where young people form tribes, conflicts are settled through a high-octane version of baseball called Extreme Baseball.
Haru, a bullied youth, is rescued by Shun, a top Extreme Baseball player, and Taiga, who aspires to defeat Shun.
Shun recruits both Haru and Taiga into his Minato Tribe, recognizing their potential.
The Minato Tribe faces a growing threat from a mysterious figure, and the newcomers must rise to the occasion to protect their tribe and city.