If you ask me what manga can would never get an anime...
I will answer Oyasumi Punpun immediately!
From the plot that radiates negativity and so damn depressing 😭
Furthermore, the art is somewhat realistic and shows you the ugly side of reality...
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And yet after reading the whole story... it will make you reflect
"Was this read something that will change my view?"
For me it indeed make me look at my current position at life~
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I won't recommend it usually with its mature tone though