So... is Chocolate Underground finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: September 04, 2008
Manga finished: June 13, 2008
... But 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 world where a new political party has banned unhealthy food, young Smudger and Huntley find themselves restricted and frustrated.
Smudger's family bakery is struggling, and Huntley can't fulfill a promise he made to his deceased father because of the new laws.
Driven by anger and a sense of injustice, they decide to rebel against the oppressive regime.
However, they quickly realize that challenging the established order is far more difficult and dangerous than they initially anticipated.