Read the novel quite a while ago, now read the comic version just for fun.
I prefer the novel to the manga (his inner musings are the best part and the manga cuts out almost all of it, so many important and hilarious or interesting details are missed, so much dark comedy is lost and the manga is also quite toned down, especially regarding sex and erotic stuff but also violence and the craziness), but I do realize that this story is far from for everyone. You need to ENJOY brutality, insanity and a completely unshackled protagonist. This is pretty much the opposite of shounen, something like a parody of the isekai genre.
He's crazy, positively insane and he'll act in a self-delusional manner while not caring about anyone. But he's also ridiculously overpowered and just gets more OP as the story goes along.
By mangaupdates score standards, this is a 8/10 for me. If the scores weren't so skewed, I'd say 6 or 7 out of 10. The novel is instead a true 9/10 but adjusted to 10/10 for skewed scores.
This story is perfect if you're tired of insufferable japanese shounen-type protagonists and their self-righteous love and friendship bullsh*t. He's insane but his mindset of actively loathing everything typical shounen and their annoying protagonists is great.
I do agree with some other reviewers that the story isn't that interesting, the protagonist carries all of it and elevates it to a very fun read even if the world building is simple. In many ways, the simple, cliché world building is by design, as if to taunt and break it. He knows the story and his situation is shit and stupid and he's very much unhappy about it to say the least.
This is going to be a hit or miss with people, like works such as "redo of healer". It's for people who are tired of self-righteous boring protagonists and can enjoy darker, more scheming or merely brutal protagonists and preferably even self-insert and enjoy the carnage. But it's going to trigger people who love the friendship and love trope. The novel is even more extreme though and really pulls no punches.
I'll just include some comparisons too between the manga and novel
In the manga, he finds an orc who has an elf tied up, but in the novel, the orc is in the process of raping that elf and she's quite broken and is used as a shield by the orc while in the manga he just kills her. In the novel, he has sex with the elf prince's knight underling but she's not really mentioned much in the manga. In the novel, he tames the saintess in the hero festival by making his underlings push her towards him, then he tames her spiritually and sexually, while in the manga he just sucks on her cheeks for some divinity. The tamer angel of noebius the oblivion dragon in the manga gets a more dominant role with little erotic parts while she's treated like a small fry in the novel, he punches her stomach then proceeds to suck her dry with his mouth until she couldn't move anymore and then he snaps her neck, they lose control of the dragon because they try to save her and there were multiple angels controlling him/holding his leash there.
I mentioned mostly erotic stuff but quite a lot of battles are changed too (like when he meets the prince in the training room, in the manga he just beats him up and the prince escapes, but in the novel, he beats him up, breaks his bones, breaks his neck and holds his neck with his spine broken so he can't regenerate and then goes around smashing him like a human weapon until his head separates from his body in a gory mess before coming back to life after a while due to the nature of that place, way gorier and funnier), along with characters, sometimes completely making up new characters are worse compared to the original and sometimes doing things like switching genders. Even when events are the same, the feeling is very different due to the lack of details which reduces brutality, craziness and humor. Towards the end of "season 4" of the manga which ends at chapter 172 (around chapter 115-145 or something of the novel), the events are wildly different, a lot of important events are ignored or changed completely to rush the story for some reason, making for a hollow shell of a story and a more stupid, rushed mc. He comes across as more clever and more in control compared to the manga, especially towards the end of previously mentioned season 4. He's more unhinged yet at the same time also more rational and logical.
Really, go for the novel instead, or read both.
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