 If you liked
Kimi wa Boku no Toriko Nare
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 ...then you might like
Crimson Empire: Circumstances to Serve a Noble
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There is a master-servant relationship. Where the maids were trained to be like an assassin/body guard in secret organizations. Although Boku no Toriko Nare is in our era where as Crimson is based in older renaissance- like times. Crimson has a more different theme where the protagonist was forced into becoming an assassin in they're organization.