This manga is an experience. Go Nagai experiments with genres, style and tone ultimately creating a story that is incoherent, full of nonsensical plot twists that culminate in a truly bizarre anti-climax ending. Amidst all the chaos, you may find elements you enjoy, but they are likely to be scarce as the manga has no focus whatsoever.

Devilman starts as an origin story for the eponymous character, only far more disturbing than your typical western comic book. This is typical of Go Nagai's work. There's plenty of violence, gore and rape from the beginning. This is in stark contrast to the art style, depicting the human characters as if they're in a newspaper comic strip like Peanuts or Archie Comics. At the beginning, Devilman even has a minor conflict against some school bullies, in the same volume where demons murder a room of people for no reason.

The first arc largely focuses on Devilman keeping his secret identity and saving his would-be love interest from the demons, making use of one time powers such as eyebrow razors that are never seen again in any media. The early part of the manga has some promise, but the tone is completely inconsistent. Most of the time it's fairly lighthearted and Devilman is a normal high school student, but there's always a sense that the plot will go off the rails.

Eventually it does, rather spectacularly. This is what brings us to the next arc of Devilman and the best one in my opinion, the one shot villains, comprising only a few chapters of the entire manga. This is where possibly the best Devilman character, Jinmen, appears and has an amazingly dark, disgusting segment and is definitely worth a look. He would go on to become one of the most featured characters in the franchise and his entire section is excellent, barring maybe the finale of the fight which inserts a moral choice in place of a logical conclusion.

The fights in this manga tend to not be satisfying as Go Nagai will pull a new power for Devilman out of nowhere for him to win. The villains, besides Jinmen and Sirene, tend to be as undeveloped. The same goes for the main characters who largely exist as plot devices or symbols to be subverted, in place of good writing. It's a shame that Jinmen did not become the basis for a slew of one shots, as this whole arc comes to an abrupt stop to make way for build up into the ultimate anti-climax. The story veers off in so many directions it leaves no room for characterization.

Up until this point, Devilman has largely not faced any conflict he can't overcome by brute force and sheer dumb luck. It is now that the writer decides that he wants to make a political story like X-Men where the demons are a symbol for downtrodden people, or something. This is the point of no return where nothing begins to make sense. The story is effectively crumpled up and thrown in the garbage to make way for a massive plot twist. Everything that happened is completely meaningless and the final chapter in particular comes out of nowhere. It gets so abstract I had to read online to understand what the last pages are showing, as it's never explained.

Overall, this manga might be worth a read to form your own opinion. I read it in a day, and I can't say it wasn't captivating, but left me feeling very disappointed. Go Nagai would go on to make other mangas that while not as experimental and acclaimed, were far more coherent and focused properly on either the violence (Violence Jack) or experimental plot (Devilman Lady). To properly enjoy them it's a requirement to at least know the Devilman story. However if you're coming in to the original Devilman expecting a deep plot, good characters and art that isn't stuck in the 70s, I doubt you'll feel satisfied.