I've only read punpun when I've felt the saddest in my life. And today I realized it I have read punpun about 3 times. Today, after not knowing what to do with such sadness, I thought about reading it again. But I stopped for a second to think: why? 
Without realizing it, it has been my escape from reality, helping me get through the worst moments of my life.
It illustrates with such closeness the fears, love, hatred, anger, family problems, suicide, insecurities and more, that it makes me feel calmer, I think that I am not the only one in the world who goes through the same thing. And that I am not alone.
It's a shame I've only read it (and I'll read it, I think) at bad times in my life. But even so, it is still a pretty big help.