 If you liked
Pluto
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 ...then you might like
Seigi Keikan Monju
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Both are seinen manga with robot that works for the police and part of the story deals with human fears of working/living alongside robots and how they could bring harm to them.
Though Officer Monju are overall lighter in terms of tone (the story becomes pretty dark later on) while Pluto are darker and is more serious right from the start.