So... is Huckleberry no Bouken 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
Huckleberry no Bouken tells the story of Huckleberry Finn, a spirited young orphan who decides to escape his life at the orphanage.
He embarks on an adventure down the Mississippi River on a raft.
Along the way, he joins forces with an escaped slave, and together they navigate the river.
Their journey is filled with encounters with various characters and exciting, often unpredictable, situations.
The series focuses on their experiences as they travel and the bonds they form during their shared adventure.