So I'm a Spider, So What?

I'm gonna survive-just watch me!
I was your average, everyday high school girl, but now I've been reborn in a magical world...as a spider?! Wait-this isn't how these stories are supposed to go! Can I get a do-over? ...No? But how am I supposed to survive in this big, scary dungeon as one of the weakest monsters? It's "every spider for herself " in here! I gotta figure out the rules to this QUICK, or I'll be kissing my short second life goodbye...
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When someone asks if you're a guardian spirit, you say...?I've really done it this time. After I saved my old classmate who's been reborn as an overpowered vampire, the townspeople took it upon themselves to worship me like some kind of guardian spirit. Not that I'm complaining about the delicious free food, but...I'm a loner by nature! I'm TERRIBLE at dealing with people! And they're not monsters, so it's not like I can just kill them to make them go away. What am I gonna do...?
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A mystery man and a smart phone? Things are about to get interesting!
I'm continuing to level up and kick some monster booty into the next stratum! But there's more to this world than I thought...and it seems there are some big figures at play behind the scenes. Like this man, for example-he just popped up out of nowhere! And...what's this? Holy crap, a cell phone?! Maybe I'll finally be able to communicate with someone down here in this labyrinth, and start getting to the bottom of things!
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I-i-it's not like a spider needs friends!
I did it! I'm finally an Arachne!...Aaand things already aren't going the way I thought they would. I'm inexplicably on a road trip with the Demon Lord, a reincarnated baby, and her troubled vampire guardian. I don't really interact with them much, besides subjecting my reborn classmate to insane training, watching the party sneak off into villages, hearing about the delicious food they eat...Wait, hold up. Doesn't it seem like I'm the only one who's being left out?!? W-w-well, the monsters up here taste delicious, so whatever! Sniff, sniff. I wonder if my other brains are having a better time... What are they even up to?