So... is Seisen Cerberus: Ryuukoku no Fatalités 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
The continent of Kuna'anh is divided among three kingdoms, all living in uneasy peace, but united by a common threat: the destructive dragon Daganzord.
Ten years prior, an attempt to seal the dragon ended in tragedy, costing many lives, including the parents of a young boy named Hiiro.
Raised by a swordsman, Giruu, Hiiro dedicates his life to mastering the sword, fueled by a burning desire for revenge against Daganzord.
Now a skilled warrior, Hiiro embarks on a journey to confront the dragon, risking everything to avenge his parents and prevent further destruction. His quest is fraught with peril, and he might succeed or become another victim of the dragon's insatiable hunger.