 If you liked
91 Days
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 ...then you might like
Kage no Jitsuryokusha ni Naritakute!
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Both series revolve around the same style worlds that are slightly at the pretext of the industrial revolution but EIS is more of a fantastical representation compared to 91 days. 91 days is definitely more grounded and logical because the story isn't entirely just a power fantasy. So if you liked the premise and era of EIS but prefer more of a revenge mystery and no power fantasy tropes then 91 days is for you.