So... is Sunohara-sou no Kanrinin-san finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: September 20, 2018
Manga finished: August 26, 2022
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
Aki Shiina, tired of being mistaken for a girl due to his looks, decides to move to Tokyo in an attempt to reinvent himself.
He finds accommodation in Sunohara-sou dorm, hoping for a fresh start and a more masculine identity.
However, his new life takes an unexpected turn when he discovers that the dorm's caretaker, Ayaka Sunohara, is quite fond of him, and all his roommates are members of the student council.
Aki now navigates his daily life surrounded by girls who often tease him about his feminine appearance, while he strives to become more manly and support those around him.