So... is Nihon Chinbotsu 2020 finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: July 09, 2020
Manga finished: December 22, 2008
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Nihon Chinbotsu 2020 tells the story of the Mutou family as they face unimaginable disaster.
Their ordinary lives are shattered when a massive earthquake devastates Japan.
As the country begins to sink, the family must fight to survive in a world that's rapidly collapsing around them.
They face not only the physical dangers of the disaster but also the emotional toll of loss and the struggle to maintain hope in the face of overwhelming adversity.
The anime focuses on their journey as they navigate the chaos and try to stay together.