So... is Hinamatsuri finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: June 22, 2018
Manga finished: July 15, 2020
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
Yoshifumi Nitta, a yakuza member enjoying his collection, has his life turned upside down when a mysterious capsule containing a young girl named Hina suddenly appears. Hina possesses extraordinary powers that she struggles to control.
Nitta is forced to become Hina's caretaker to prevent her powers from causing destruction. He soon discovers that Hina's abilities can be surprisingly useful in his yakuza dealings, even unintentionally.
As Nitta navigates the challenges of managing Hina's powers and his yakuza life, he finds himself in increasingly bizarre situations. The two form an unlikely duo, with Nitta hoping Hina's powers remain an asset rather than a threat to him.