 If you liked
Yuusha, Yamemasu
|
 ...then you might like
Helck
|
Both involve a hero that has changed affiliation to the demon side to wage war against Humanity.
The demon lord opposes the hero in both categories. But eventually sees them as an aid to the demon army
Both have almost identical stories, Both have a Human, joining an army of demons, and they improved the army with their skills
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Recommended by alirezasharifi
-Both has protagonists who despise humans
-Protagonists help the demon lord's army
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Recommended by I_dont_like_loli