 If you liked
Monster
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 ...then you might like
Happy!
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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. A must read for every manga fan in my opinion.