So... is Ane Log: Moyako Neesan no Tomaranai Monologue finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: April 15, 2015
Manga finished: April 20, 2016
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
Ane Log centers around Moyako, an older sister, and Akira, her younger brother.
As kids, Akira innocently declared he wanted to marry Moyako, leading her to believe he's a pervert.
Now teenagers, Moyako embarks on a self-imposed mission to "correct" Akira's supposed obsession with her.
The humor arises from Moyako's overactive imagination, where she misinterprets innocent interactions with Akira as evidence of his "perversion," often leading to comedic and exaggerated scenarios entirely within her own mind.