 If you liked
Black Jack ni Yoroshiku
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 ...then you might like
Dr. Kotou Shinryoujo
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Both are medical manga dealing with doctors as main characters. Whereas Dr. Koto is more light-hearted and irrealistic (a doctor that can perform miracles), Say hello to Black Jack is of completely different vibe (the doctors are powerless and the medical world is corrupted by competition, money and apathy).