So... is Hanasaku Kizuna no Romantan finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Hanasaku Kizuna no Romantan tells the story of Himawari, a Sprite, and her detective friend Tsubaki, who are living peacefully in Romton after fleeing their homeland due to an invasion.
Their peaceful existence is disrupted when their friend Ajisai is kidnapped.
Himawari and Tsubaki embark on a mission to rescue Ajisai, facing unexpected obstacles, namely the dreaded Vivolian army, along the way.