That's one of the funny things in this series (Web Novel, Light Novel and Manga). IMO Katsuya is the average isekai MC that is overpowered and that people in the world just love for no reason, while also having a lot of things being handed to him. But we don't get to pay attention to this in...
I like Glasses-san and Closed Eyes-san a lot; they all have their own circumstances, but both seem to have things figured out more than others, so it would be nice to see them as the "chosen one," even though I think that the MC shouldn't be in a relationship at all until he figures himself out.
What a wild ride. Thanks for the TL. And honestly, i like the ending because it shows that they had their time together, but there will always be a shadow of regret for what was done.
And also, the last time we get to see sensei is while she's crying on the bathroom floor, really hits hard.