So... is Hortensia Saga finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: March 25, 2021
Manga finished: November 27, 2020
... But 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 Kingdom of Hortensia is thrown into chaos by a sudden and brutal rebellion, leaving the royal family decimated and the land vulnerable.
A young man named Alfred Ober inherits his father's aspirations to become a knight after tragedy strikes, and under the guidance of a seasoned knight, Maurice Baudelaire, he begins his training.
Alfred is joined by the mysterious Marius Casterede, and together, they strive to bring hope to Hortensia amidst the darkness caused by the rebellion.
As the new king is crowned and the hunt for a missing princess intensifies, Alfred, Marius, and Maurice, alongside allies both old and new, dedicate themselves to protecting their land and restoring peace to Hortensia.