So... is Blend S finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 24, 2017
Manga finished: April 28, 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
Blend S is a comedy anime about Maika, a high school girl who struggles to find a part-time job because of her unintentionally scary smile.
Her luck changes when she's scouted by Dino, the manager of Café Stile, a unique coffee shop where waitresses embody specific character archetypes.
Maika is cast as the "sadistic" waitress, a role that surprisingly suits her because of her natural expression.
The anime follows Maika as she navigates her new job, learning to embrace her assigned persona and working alongside her quirky colleagues, Kaho and Mafuyu, to create a memorable experience for the café's clientele.