Somehow Aimer's Us is forever stuck for me as soundtrack for this manga. Mostly for its later part.
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BTW... Why has not this been serialized into an anime still?
I think I know what Punpun could look like if it got anime adaptation: coloring as in "Totsukuni no Shoujo" (anime I mean) and transitions as in "Sonny Boy". I think this combination amd the different moods the parts can produce alone, could present Punpun quite well. Not sure how some hyper-realistic panels would be adapted though. Whether they could fit.