 If you liked
Kentou Ankokuden Cestvs
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 ...then you might like
Dorei Yuugi
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Slavery: enslaved people are being put in a fight against other people (also enslaved or not). Most of the other slaves shown break down at the sight of the cruelty, though the MC perseveres no matter how harsh the current situation is.
<>Kentou Ankokuden Cestvs is Historical but there are less horror scenes. Dorei Yuugi is a lot more rough to wrestle through.