So... is Zettai Bouei Leviathan finished or not?
YES, it is finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is complete.
Watching Order (by release date)
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Synopsis
In the lush world of Aquafall, a sudden meteor shower unleashes a wave of destructive beings.
To combat this threat, the fairy Syrup forms the Aquafall Defense Force.
This team consists of three dragon-girl recruits: Leviathan, Bahamut, and Jörmungandr.
The anime follows Syrup and the three dragon girls as they learn to work together, battle the encroaching evil, and mature along the way, all while striving to protect their home.