So... is Isekai One Turn Kill Neesan: Ane Douhan no Isekai Seikatsu Hajimemashita finished or not?
It is a bit ambiguous in this case.
Why?
The anime finished before the manga:
Anime finished: June 24, 2023
Manga finished: July 28, 2023
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
Asahi, an otaku, gets transported to another world thinking he'll have amazing powers. He quickly learns he's just ordinary.
Luckily, his overly protective sister, Maya, follows him and gains incredibly strong abilities.
Together, they try to return home, but discover they might be destined to save this new world from a powerful Demon King's army, with Maya as their only hope.