So... is Samurai Giants finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 15, 1974
Manga finished: September 17, 1974
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
Samurai Giants follows Ban Banjou, a rebellious and untamed youth from the coastal region of Tosa.
He possesses incredible natural talent as a baseball pitcher, specifically a devastating fastball, but struggles with accuracy.
The anime chronicles Ban's journey as he joins the prestigious Tokyo Yomiuri Giants, navigating the world of professional baseball.
He faces fierce competition from rival batters, pushing him to hone his skills and develop extraordinary pitching techniques.
The story focuses on Ban's growth, both as a player and as an individual, as he strives to master his abilities and overcome his weaknesses in the high-stakes environment of professional baseball.