So... is Seton Doubutsuki: Risu no Banner 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)
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Synopsis
Seton Doubutsuki: Risu no Banner tells the story of a young squirrel named Banner, who unexpectedly finds himself living on a farm.
He's taken in by a kind human, but an unlikely bond forms when a house cat, instead of harming him, adopts Banner as her own.
Banner experiences a period of happiness and learning under the cat's care in the safe environment of the farm.
However, their peaceful existence is tragically disrupted by a devastating fire that forces Banner to face the harsh realities of the world alone, separated from his adopted mother.