So... is Spectral Force 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
In a world dominated by demons, humanity struggles for liberation.
A group of human rebels acquire a powerful weapon capable of killing demons, aiming to assassinate the Demon King Janus.
Princess Hiro, a character with both human and demon heritage, finds herself torn between her loyalty to her homeland and her animosity towards humanity.
She must make a difficult choice: either reconcile her conflicting feelings and unite against a greater threat, or risk a devastating war that will engulf the entire world.