So... is World Destruction: Sekai Bokumetsu no Rokunin finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 30, 2008
Manga finished: July 27, 2009
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
World Destruction: Sekai Bokumetsu no Rokunin takes place in a harsh world dominated by beastmen, where humans are essentially treated as property.
The story centers on Kyrie, an individual who unexpectedly becomes involved with a group known as the "World Destruction Committee."
This committee's goal is to bring about the end of the existing world order.
Kyrie possesses a unique ability that is crucial to the committee's plans, making him a key figure in their mission to reshape their reality.
The anime follows Kyrie and the committee as they navigate this dangerous world and work towards their ultimate objective of destruction.