I read so much isekai that all those tired old tropes apparently don't bother me, either, all that much. But they do make the value the series with such tropes much lower than those random gems that avoid them.
For the most part that's true of me as well, though I've yet to start dredging up the
murkiest depths, just digging pretty deep. I still cringe looking at most the titles, "I blah blah blah", "blah blah so I blah blah." First person pronouns, man. This manga's 'My' is a little better, albeit not by much. Though trying to name my own writing, I do admit it's actually quite challenging to come up with a title that is short, relevant to the story without spoiling things, and evocative.
Slavery in isekai wouldn't actually bother me if it wasn't depicted in such a positive manner. If it was slavery where the slaves want to be free, it would be much better. But it's always the male MC acquiring female slaves who are perfectly happy to be his slaves. In the worst series free women actually want to become the MC's slaves. Of course there's normally some stupid boost they get by becoming a slave to serve as a ridiculous justification. I also like Shield Hero's beginning because there really wasn't anything positive about it. The slave mechant is an obvious shady person and the slave was bought with no holier-than-thou feelings. Naofumi needed a slave in order to survive and he didn't pretend it was anything but slavery enforced by magic.
Honestly, I don't think I'd even mind it if the MC took in a slave girl that was perfectly happy to be his slave, so long as she was eventually set free. 'You don't need to be a slave to stay by my side,' yada yada. Could serve as some nice character development, though isekai are often allergic to that.
Thankfully I don't think I've encountered
too many where free people are actively wanting to become the MC's slave, Shield Hero aside. I imagine it's not that uncommon with the dregs of isekaidom, though. Maybe the one with the guy larping as a demon king? His name was Diablo, I forget the series name. The two main female leads were enslaved due to reflected contract magic, but I can't really remember if more people joined in or if it was anything other than incidental beginning to the plot. That series was actually fairly decent, the juxtaposition between trying to present as some almighty confident ruler and mentally freaking out is vaguely similar to this series, though intentional rather than a forced quirk like poor Harold's arrogant mouth.
I intend to go with the slavery trope in my own story, but the MC wil not have a slave of their own, and it will generally be presented as pretty much purely a bad thing that should be eliminated. As far as involvement with main characters goes:
The history of one of the main girls has her parents being killed by another 'isekai'd person' wanting them/her as a slave due to being a rare type of demi-human, being a sort of 'collector'. Though she's not aware of it herself.
A later heroine will initially appear as if the MC will get a slave contract/death link (if master dies slave dies) for her, but he'll overwrite the terms in a way that could be considered a self-sacrifice because he finds it morally unacceptable to enslave someone if there's an alternative. (It makes it two-way, so the slavery aspect is negated but their lives become linked, putting himself at risk.)
Then again, even if I'm trying to handle slavery better than standard faire, I also intend to go full harem, so I can't hold my head
too high, lmao. As in, actual polygamy, rather than a crush asterisk of five girls lusting after one indecisive person.
Still, I believe it
can be done well, and the key is that all the girls need very strong bonds as well. OteMob is much of my inspiration, the connection between the two main girls might honestly be developed a bit more than their connection to the MC, and it seems completely believable, in fact, pretty much
inevitable that it ends up as a harem of the three rather than one being picked over the other. (Other girls that apparently get introduced... perhaps not so much.
I saw it mentioned in one of those "Ask questions about/interviews in Japan" Youtube videos that high school is the best time in a Japanese person's life. Because after that, the around the clock grinding of working life (in a black company) starts to get so close, even if a student continued to college or other further education. That was presented as one reason for the popularity of high school themed manga/anime. So, if you are a high school student, chances of being happy already are higher, so getting summoned instead of dying for a fresh start might be more relevant.
Not entirely wrong for Westerners either. I personally long for high school as well to be honest, even though I'm only mid twenties. Admittedly, I think part of that is as much part of surrounding circumstances as it is about 'school life' itself. So more about the time period than the occupation.