So... is Kick no Oni 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
Tadashi Sawamura, a confident and skilled karate master, believes his martial art reigns supreme.
Driven by pride, he steps into the world of kickboxing, aiming to demonstrate karate's dominance.
However, his initial foray into kickboxing ends in a shocking defeat, leaving him severely injured.
Following his recovery, Sawamura is presented with a challenging proposition: to learn kickboxing himself.
This journey becomes a quest for redemption, as he seeks to reclaim his honor and prove his strength in a new discipline.