So... is Busou Chuugakusei: Basket Army finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: December 20, 2012
Manga finished: March 05, 2013
We could not confirm the source content in MangaUpdates.
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
Busou Chuugakusei: Basket Army focuses on Touko Natori, a middle school student at a defense academy undergoing rigorous field training.
As her training nears its end, an intriguing extracurricular activity is proposed by her instructor, Kamiya: Newest Weapons Research.
However, before this research can truly begin, a significant event throws Japan into turmoil, likely impacting Touko and her fellow students' lives and training.
The anime seemingly explores the juxtaposition of everyday middle school life with the serious implications of defense training, hinting at a story where the characters must grapple with an unexpected national crisis.