So... is Ayakashi Triangle finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: September 26, 2023
Manga finished: September 25, 2023
... 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
Ayakashi Triangle follows Matsuri, a ninja exorcist, who dedicates his life to protecting his childhood friend Suzu, an ayakashi medium who attracts supernatural creatures.
Their lives are turned upside down when they encounter Shirogane, a powerful ayakashi who wants to devour Suzu.
Matsuri manages to thwart Shirogane's plan, but as revenge, the ayakashi transforms Matsuri into a girl.
Now, Matsuri must navigate life in a new body while continuing to fight ayakashi and protect Suzu, all while their relationship becomes increasingly complicated.