Episode 9
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So there is a major time async going on, after all. Apparently the human academy scenes are whopping 15 years in the future. It would suggest all the isekaied folks of that class were born at approximately the same time. It's quite a weird way of telling a story, with a 15 years of difference between the two stories, yet they are all the time mixed together in the episodes. I can kind of understand now why the manga adaptation hasn't included those student scenes at all. It probably wasn't a super difficult decision even if the novel did have them mixed together like the anime (though I wouldn't know).
Now we are left wondering what Kumoko is in that 15 years in the future world. Considering her speed of progress, you'd think she would be at least as powerful as that demon lord, who obviously is also some kind of spider creature.
It's a relief to know the timelines now, for sure, nonetheless.