So... is Attack No.1 finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: November 28, 1971
Manga finished: November 27, 1971
... 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
Attack No.1 follows Kozue, a dedicated middle school student with aspirations of joining Japan's national volleyball team.
The series documents her journey as she progresses through various leagues, from local school competitions to the national volleyball finals, and ultimately aims for international championships.
As Kozue achieves greater success and recognition, she begins to encounter the challenges that come with it, including the pressures of high expectations and the negative effects of envy and pride among her peers and competitors.
The story explores how Kozue navigates these increasingly difficult circumstances while striving to reach her ultimate goal.