Speaking of music, both OPs written in 2010s-appropriate style, but 2nd feels to me, personally, more freshly, like a good update of 1st one.

In the anime itself, I noticed that, the main character interacts with a fairly wide range of secondary (though they are more like "primary") characters. It was entertaining to observe the main character's interaction with them. If you think about it, Ika Musume is like an isekai but vice versa (if assume Chizuru is just a human).