In about 2~ or so volumes you'll realise that it's set on the future

She actually is a spider, it's hinted early on but it was not revealed until much later.

SHE IS! Kumoko isn't the girl in the class that she thinks she is. Kumoko is a spider that was in the classroom that managed to tag along. Said girl is the Administrator D, and gave Kumoko a copy of her human mind for reasons that are entirely in line with her character T_T. She's LITERALLY a spider with a human mind shoved in.

I didn't read the 'Past Arc' yet (I temporally jumped over it like what I almost did with the sidestories) but to me the only the protagonist is Shiro even if it is hilarious to see the difference between the another point of view since Shiro is rather emotionless with a human body XD

This novel is the story of a simple spider who had to survive in a world where everyone else was stronger than her while thinking she was a human in a body of a spider monster and evolving herself to survive while dealing with the awkwardness of not knowing how to act around humans, it is really complex... and I love every second of it, I have no doubts that I'll read it again and again when I feel nostalgic or then more chapters shows up

This novel is actually pretty cool, though at first its a tad bit boring as time passes and our beloved kumoko fights stronger enemies, win, level up, earn skills, earn titles, and evolve, it gradually starts getting more exciting every chapter, though sometimes the author needed to make Q/A chapter just to answer some questions, all is good. At first (especially at the great war side story) the timeline got super messy as the side story from the the future actually got released Before the actual thing happening you would absolutely get confused. But every once in a while the author will throw a mystery thing there then gradually reveal it after some chapters, it was quite amusing, though for some it might be annoying though.

The story is essentially spoiled early on, though it appeared as if it wasn't supposed to be anything more than a mid-story war/battle. But nah, after 13 volumes, time finally syncs up and we're there, a mere 3 volumes until the story is finished, the battle happens in one volume and v15 is build up to volume 16, not a particularly interesting climax if you could even refer to it as that. The elf battle we get to know about very early on takes that long to finish, seriously. Especially the several volumes approaching it which was basically just to sync time between everyone ends up feeling useless and boring, then the story finally starts moving at volume 14 but nothing interesting happens for the rest of the volumes either and then it's done... I guess it was pretty interesting to see the reincarnations interacting but that's also cut short.

I have rarely seen more uninteresting main antagonists and main characters. Ariel is kinda boring, so is her backstory. Dustin is boring as well, way too one-dimensional. When it comes to perhaps the main villain of the story, if we exclude something like D the ultimate god or whatever, he is so utterly, tiresomely uninteresting and boring. His motivations, his actions and his childish personality is nothing but a pain to read about, I don't even find him hateful, I just find him as lacking the worth to read about and as a very bad choice for an antagonist, this author has failed utterly in several of the most important characters. Although I do have to admit the last part of volume 14 when potimas gets owned and killed is very satisfying albeit anticlimactic, that'spretty much the end of the novel except for the v15 and 16 that is a build up followed by a little quest for the destiny of the world by D the evil god

In this entire novel, hardly anything happens. It can be summed up as a 1/3 being in the labyrinth where things actually feel like they somewhat progress and was interesting, then they get out, fight a tiny bit and meet ariel the demon lord, stop at the town with reincarnation vampy sophia and save her from the "ewhil" clutches of, then they go on a journey that we can't really follow and stop in a few towns, mainly time skips, kill off an UFO they somehow found on the way filled with tech from the childish antagonist that he provided the schematics of but didn't build, the MC becomes a god suddenly by swallowing a bomb and loses her powers for a while, they travel forth, find a s*upid oni and get a bit roughed up, then they're at the demon territory where we don't get to see much more than some very short meetings and them living in a mansion for a while and apparently getting a bit stronger, the MC gets drunk and suddenly can use magic again though she has to train to get stronger, which we don't really see, then they do a little battle between the demon and human army in one volume where the MC isn't truly involved, suddenly they're at the elves forest and finishes him off and then they deal with the reincarnations for an entire volume and prepare for the last battle that won't be that interesting either and one volume is too short to wrap everything up properly. There you go, entire novel summarized, that's ALL THAT HAPPENS and we barely even get to see the story happen, 80-90% of the story focuses on inner monologues after all, stuff that actually happens isn't much at all. Of course we get some side stories explaining the same thing from different perspectives of characters that we don't care about and that are killed off or never important in any way and some background stories. It just makes things "better" (sarcasm) that we just find out various things and abilities of the protagonist far after she gained them, we never gets to see any of the process after she leaves the labyrinth and becomes a god, it just happens and is told to us during the battles that she has this or that power or resource