I don’t think the series is inappropriate at all. Like, even if I had children and saw one of them reading this series, I wouldn’t mind it.

There are quite a few manga and anime that have inappropriate relations between teachers and students, but this one gets singled out (even if it’s not that inappropriate, looking at your comment)?

Bingo. I know plenty of those, and even read one or two of them; I don’t think it’s morally bad, because it’s all fiction. But I do get pissed at this sort of double standard, where I get to enjoy even raunchy things and other people can’t enjoy even inoffensive things because they happen to be gay, fuck this shit. (Sorry for the swearing, it isn’t targetted at you, I’m just angry.)