So... is Takarajima 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
Takarajima follows the adventure of a young boy named Jim Hawkins, who gets caught up in a quest to find the hidden treasure of the notorious pirate Captain Flint.
The journey takes an unexpected turn when someone close to Jim, a man named John Silver, reveals a hidden agenda and takes control of the expedition.
Jim is then faced with the difficult task of navigating betrayal, confronting his feelings about Silver, and ultimately, dealing with the dangerous situation he finds himself in on the search for Treasure Island.
The story focuses on the complex relationship between Jim and Silver, even after Silver's true colors are revealed. Jim must come to terms with this relationship as he confronts the challenges ahead.