 If you liked
World Destruction: Sekai Bokumetsu no Rokunin
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 ...then you might like
Arslan Senki (TV)
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"Sands of Destruction" / "World Destruction: Sekai Bokumetsu no Rokunin" and "The Heroic Legend of Arslan" / "Arslan Senki" are pseudo-medieval fantasy series that focuses on a naïve male protagonist who is inexperienced with the real world.
In both these shows, the system of slavery in place forces people who are seen as being of lower birth into harsh labour.