The Unwanted Undead Adventurer

The Unwanted Undead Adventurer is also listed as Nozomanu Fushi no Boukensha on some trackers — same show, different title convention. It's a ONA across 12 episodes out of CONNECT. It's finished airing, so the whole thing is watchable start to finish.

On the shelf it sits under Action, Adventure, and Fantasy — worth knowing if you're comparing action anime specifically. Liked it? The related picks below start with Attack on Titan, pulled from the same genre lane.