So... is Hitorigurashi no Shougakusei finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: December 12, 2017
Manga finished: November 10, 2016
... 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
Hitorigurashi no Shougakusei centers on Rin Suzune, a young girl who suddenly finds herself orphaned and running her family's restaurant.
Despite her best efforts, Rin struggles to keep the business afloat due to her inexperience and faces hardship, including bullying at school.
The anime follows Rin's daily life as she navigates these challenges, trying to manage the restaurant and support herself.
While her cooking skills leave much to be desired, Rin's determination and genuine heart attract the support of the local community, who are eager to help her succeed.