Hmmm. This show is interesting, but I kinda worry about what will happen or what the goal of this story is going to be.
In the end, she is a spider and even if she gets super strong, she won't really be able to live a normal life anymore, nor will she able to meet up with of her classmates who seem to have been turned into humans, mostly.

And basically, they have been in this new world for ~15+ years now?
Are we looking at 2 different points of time?

Spider Stuff = immeadiatly after what has happened in school
Human stuff = 15+ years later?