 If you liked
Monster
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 ...then you might like
Master Keaton
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Both series are written by the same author. Due to this the art (very well done in my opinion) looks alike in both series. If you like the way Naoki Urasawa tells a story and you like the general atmosphere of his stories than you should really read Monster. In my opinion Monster is by far his best work. It is the most deep and well written story I ever read. Of you like one of the main characters I am pretty sure you will like the other one too. If you haven't already you should give both series a try!