So... is Onsen Yousei Hakone-chan finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: December 27, 2015
Manga finished: April 09, 2014
... 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
A magical being, a hot springs fairy, has been asleep for a long time.
Upon waking up in the present day, she finds she's transformed into a much younger version of herself.
Now, she must navigate the unfamiliar modern world while working with the people around her.
Her main goal is to recover her lost powers and return to her former self, all while learning about this new era.
The story follows her daily life and the challenges she faces as she adapts and tries to regain what she has lost.