My first time reading an "isekai" story (unless Sword Art Online counts), and it turned out pretty well. Maybe the benefit was that Konosuba seems to be primarily a comedy series, but it wasn't so disgusting to follow a hikikomori victim of Truck-kun as reincarnated in a fantasy world with rules inspired by RPG elements. I'm too lazy to research what were the first proper isekai stories which followed .hack// and Sword Art Online's example of people getting trapped in pre-existing virtual worlds (or, for that matter, Digimon), but it seems pretty clear that Konosuba is meant to be a parody, with main character Kazuma not being as over-powered as a wish-fulfillment series might usually require of its self-insert-y protagonist.
Kazuma died in the real world from an unfortunate chain of events stemming from his first attempt at leaving his house in ages. Upon picking up the limited edition of a new MMORPG, he sees a young girl about to get hit by a truck, and decides to be cool and jump in to save her. He gets hit, and dies. As it turns out, it wasn't a real truck, but simply a tractor. And the girl would have survived regardless, having realized the situation soon enough. And Kazuma didn't even get hit by the tractor, but rather went into shock thinking he was about to die from the collision. But not after shitting himself. Or so he is told by the goddess Aqua, whom he meets in limbo, before she reincarnates him into the fantasy world. Despite these circumstances, Kazuma somehow believes himself to have had great luck in his life, manifesting itself in an absurdly high Luck stat in the new fantasy dimension. Aside from the events of the novel's prologue, we see nothing of Kazuma's earlier life, so we can only trust him when he says he's an expert in MMORPGs (even though he seems to refer mostly to Dragon Quest and Monster Hunter, neither of which is an MMO [unless we count DQX, I guess], so whatever), and his rough knowledge of the basic workings of fantasy RPGs (starting in a small town, becoming an adventurer, and taking quests and killing monsters to gain money and experience points) seems to be the cause for his initial successes in the new world, not so much his apparently great Luck, which seems to not work so well even in important story situations.
So basically it isn't painful to read at all, since it seems the author is trying hard to make Kazuma out to be as average as possible. But I guess this is kind of a negative, because it makes him out to be more relatable for the majority of readers, who would themselves be average Japanese youths with near-otaku interests. And god damn the author for writing at length in his Afterword about how great it is that Kazuma is so average, as though this isn't an absurdly popular method of writing a main character in Japanese media! But at least Kazuma has that sarcastic, dejected sort of personality expected by these sorts of characters, that sense of cynicism that keeps the potential harem from fully realizing itself, pushing the novel away from being a true bottom-of-the-barrel wish-fulfillment tale (because, really, how many modern Japanese act this way in real life?).
As is probably the main draw for a series like this, the girls are good. I've seen people on /a/ talking about how retarded Aqua is, but it didn't seem to be so bad here (I mean, the shitposting was affectionate anyway). She's certainly kind of dense, but not to a point where it justifies her apparently abysmal Intelligence stat, which I suppose runs counter to the author's intent with her characterization. The times when she seems most stupid seem a little contrived, honestly - particularly when it seems she's forgotten she's a goddess after only a couple weeks of living in the fantasy world. And it's kind of weird she doesn't seem dumb at all in her introduction in the Prologue, but I suppose this can be justified because she was previously in her comfort zone in limbo and maybe her idiocy only manifested itself during her incarnation into the new world. She does complain a lot, but in a way that reminds me of Index's whining "Toumaaaaaa..." from A Certain Magical Index, and that's quite okay by me. Also, perhaps most importantly, she benefits the most by the illustrations in this volume, particularly her thighs in the image of her in the cage, and her tits near the end during the Dullahan fight.
Megumin I expected to like the most, based almost solely on her chuuni demeanor and her DFC (I've saved several images of Megumin off of /a/ before ever reading this book). Unfortunately, she doesn't seem to flex her chunni-ness so much. Perhaps due to the short length of this novel, we don't really get enough interactions between Kazuma and the non-Aqua girls to really see them shine. Megumin's infatuation with the Explosion spell is a huge part of her character, and indeed that very quality leads to the conflict at the novel's climax, but I felt like we were missing something more. The girl has red eyes, an eyepatch, bandages on one leg, and she introduces herself by doing a silly pose, yet we barely get any real chuuni shit. Really, her passion for Explosion kind of just makes her feel like a more general "genki" character, which isn't so bad, but I feel betrayed by her character design. And it seems there were too few mentions of her fondness for Explosion bordering on eroticism. Not that I explicitly wanted more, just that it seemed underutilized, other than to just piggyback her primary defining trait on top of Darkness's. I will admit I did like when Kazuma feels her try to press her itty-bitty titties into his back near the end, but that plebeian still dismisses her as "jailbait."
Darkness is pretty great, with her masochistic lust never getting satisfied due to Kazuma actively ignoring her interests and choosing to engage in quests that would avoid her desire to get jumped by monsters. Oddly, from everything I've seen before actually experiencing the series, it seems she has the biggest breasts of the initial cast, yet we do not get an illustration of Darkness sans plate armor, and Kazuma's description of her unarmored body isn't quite so descriptive as to actually point out how well-endowed she is, other than a vague insinuation that she's better endowed than Aqua and (obviously) Megumin. Hell, the word Kazuma uses to describe Darkness is "svelte," which really only suggests she is not as muscular as her large armor would suggest, and kind of goes further to suggest she'd have smaller boobs. Which, I mean, whatever, Aqua's boobs look pretty great in the actual illustrations, so Darkness's may potential border on being near-unattractive cowtits (too lazy to search for official art of her tits), but still. Back to more "serious" subjects, it seems her strong desire to protect, the actualization of her Crusader/Paladin instincts, have a disproportionate weight to them during the final battle with the Dullahan. Wasn't really buying Kazuma's emotional response.
Bonus points for Wiz's ass in the illustration of her meeting with Aqua.
Lastly, it kind of bothers me that there is a final battle at all. I mean, it's a light novel, a final battle is to be expected, regardless of general comedy-focus earlier in the story, but it seems to conflict with the basic design of the medium. This isn't an issue for this novel/series specifically, but for most (if not all) light novels I've read recently, just that it finally stuck out to me while reading this one. If the purpose of a light novel is to receive an anime adaptation in order to serve as a long-form advertisement for further installments in the novel series, why does every novel follow the same standard plot development? I am not necessarily complaining about the climax being a fight scene, but rather I am complaining that there is an obvious climax at all. In general, an anime adaptation of a light novel will adapt two or three novels per 12/13-episode cour, meaning each series ramps up toward a climax, resets in the next episode, crescendos again, &c., &c. It works for prose fiction, but it seems weird in a serial animation, unless in the odd case of The Melancholy of Haruhi Suzumiya, which initially mixed the episode order up a bit. It always gets to a point where I would reach the last chapter of a light novel and think to myself "alright, some stakes are going to be introduced soon, likely involving things mentioned earlier in the novel," which I suppose is true for any narrative in any medium, and it's really only my fault for reading anime books when I kinda hate storytelling. Maybe that's just my fault for having gotten a literature degree out of love for pure prose and wasting all my time on light novels instead of big-boy books. Oh well, I guess it can't be helped.