So... is Gi(a)rlish Number finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 23, 2016
Manga finished: May 30, 2017
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Gi(a)rlish Number follows Chitose Karasuma, a college student seeking a glamorous career and avoiding mundane adult life.
She impulsively joins a voice acting agency, "Number One Produce," run by her brother, expecting instant stardom.
However, reality hits hard as she struggles to land significant roles and faces the competitive nature of the voice acting industry.
The anime explores Chitose's journey as she navigates the challenges, clashes with fellow voice actresses, and learns the complexities of achieving success in this demanding field.
It's a story about ambition, the gap between expectation and reality, and the often-unpleasant truths of the entertainment world.