So... is Bosco Adventure 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)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
The peace of Bosco World is threatened when Princess Apricot, the future guardian of the vital Fountain of Life, is kidnapped.
If she can't reach Fountainland and ascend to the throne before the next solar eclipse, the Fountain will dry up, endangering all life in Bosco World.
A group of brave forest animals, including Frog, Otter, and Tortoise, embark on a perilous journey with the Princess to ensure she reaches her destination in time.
Their adventure is filled with hope and determination to restore balance to the Bosco World.