This is NOT your average slice-of-life manga. I repeat, this is not for the faint of heart in the slightest.
Oyasumi Punpun can be described with as many adjectives as possible under a heavy exhale - raw, depressive, melancholic, disturbing, at times even horrifying, and also very surreal and avant-garde.
Most of all, it's real. Extremely real for some, I might add.
It's disgusting. It's abhorrent. And it's unapologetic in its realistic nihilism towards the characters' motivations in the town of Punpun Onodera, a troubled and pessimistic individual who grows from a reclusive yet optimistic elementary schoolboy, into a brooding, misanthropic young adult as a result of the events that unfold around his nuclear family and fellow close ones.
Several events that occur in the manga are honestly some of the most vile and putrid acts I've seen in contemporary manga, including, but not limited to: rape, assault, and suicide. It's utterly brutal in the way that Inio Asano portrays these acts in a disaffected manner, from an amoral standpoint, which makes the acts even more disturbing to more ethically-inclined manga consumers.
If anything can be considered the closest thing to modern art in contemporary Japanese literature, Oyasumi Punpun is a strong contender as being the greatest Japanese literature-based work so far, like a modern-day twisted, lucid approach to a classic Greek tragedy.
This is essential viewing for any fan of manga/anime, but a very strong advisory for those who are emotionally unstable, or clinically depressed while reading this manga. I sure as hell am not going to read this again for a while. Need this whole thing to set in first. Tonally, I've seen many anime and manga go to places where Western animation can only dream of mustering their scenarios towards. The examples are plentiful, so I'll name only a few for the sake of convenience and avoiding as much redundancy as possible.
Grave of the Fireflies deals with an incredibly tragic tale of two siblings surviving in a post-WWII Japan, borderline apocalyptic in subtext and in actuality.
Berserk is a ruthless depiction of a fantasy world, completely deconstructed into the malicious hands into the darker side of humanity, if such a world existed in real life.
You have your sad, bittersweet endings of lauded romance anime like Clannad and Angel Beats, and they do hit very hard, right into your very vessel.
At least all of the aforementioned anime/manga above have some kind of redeeming qualities for the main characters of their respective stories.
Oyasumi Punpun is a different beast altogether. Punpun Onodera is a bitter, neurotic wreck by the end of the manga, and it's heavily implied that he's stuck with those exact, nihilistic values of life he's conjured in his mind over his years as a pitiful, sympathetic "anti-villian" of sorts. He loses all sense of redemption over the course of before he meets Aiko as a 20-year-old young adult, completely convinced of humanity being utterly wreched and self-centered, believing their actions to be solipsistic in nature, never truly meaning to benefit other people just because they can.
One could choose to leave this world, if they could, but even Punpun is too self-conscious for such a thing. He's so afraid of any kind of pain imaginable that even the easiest ways out become a phobic hassle by themselves.
The harsh truth of the hedgehog's dilemma is that with emotional vulnerability, you experience the full scope of human pleasure as well as narcotic despair and misery. Punpun decides to inhabit a hedonistic lifestyle and attitude, as the traumatic events of his life pile up into his psyche, never opening his already fragile shell with someone he probably could trust, but it's the easier way to deny the pain of living and rely on immediate gratification to numb his own depression. It all coalesces into the final volume of the manga as Punpun's psyche begins to break, and then reset itself into a sort of reluctant acceptance of life's harsh circumstances and situations, but a faint hope of happiness straddles its path beneath all the bleakness of Punpun's existence, what with finding and reuniting with his fateful love, developing a reasonably close bond with a person who he's able to somewhat trust and confide in, and the reconciliation with a particular loved one.
And sometimes it can seem too cynical of how it depicts people's tendencies to be self-centered, and not the other way around, when even the most "angelic" and pure-hearted of the characters are severely flawed by their inability to truly open themselves up to others, for fear of appearing too eccentric, too kind, or even too reminiscent of our bestial, survivalist sides as just barely civilized people.
I loathe that I deeply relate to Punpun. I really do.
It may very well be the bleakest manga ever written, but it's also the greatest manga ever written notwithstanding, or because of such notion.
Reality is often more disturbing than fiction.
10/10