Phymiath, thank you for replying directly. I was in no way criticizing your decision. It is your decision to make. I was calling into question its necessity, mostly because I have noticed a tendency to blow things having to do with Manga WAY out of proportion.
I did feel uncomfortable reading it. I felt bad, pain even, for the whipped girl...
However I feel anger more than anything. Anger at how the mangaka is essentially sensationalizing this. Everything (almost) in this manga is sensationalized and most of the tragedy is completely unnecessary.
Most "pulled into another world" manga are about an empowered beyond human means human doing things with their new power. Often these are unnecessary (either at all or in scale), but this manga doesn't follow the premise of "empowered in a new world (by the mechanics of that world)" but instead "unrealistically 'perfect' people going to a world 'worse off than our own' to solve things that have been solved with time here". And I feel that I must point this out, most of what they are solving and the ways they solve it can be done HERE, so not only isn't the"other world" necessary, it is negligent...
Often the Isekai manga have some grasp of the relationship these medieval European worlds have/had and work around that. This one does not (appear to). It uses this well known construct in the same way some manga/mangaka use Japanese isolationism to construct their fiction: "we were right to isolate, the rest of the world is factually out to destroy us for our indepence and resources. They are monsters and we are the only civilized people." While it is true that the west created unfavorable relations (treaties) at the time, Japan has seriously benefited from it, and themselves began taking a Brittish stance of creating colonies (i.e. WWII). Basically, they are missing the point entirely. They could use the story to show how unfair the world is/can be (e.g. parts of "Happy World" among others), but instead they use it only to further how "awesome" the seven are.
(The above paragraph was an edit. And since I lost track trying to research the above point I will stop here so I don't say anything -further- stupid)
So, yeah, I feel bad for the little girl, her family, and the village. I feel bad for the entire world there, but I also feel that they are an unnecessary artificial construct created purely to show how "awesome" the seven are. And, I feel that I need to point out that the mangaka has, themselves pointed out how unnecessary some of the new events are since the weapons they manufacturer could sweep through the medieval era they are in, and they coukd provide aid once the hostiles are removed - i.e. they are letting people suffer.
So, I wasn't calling into question your right to put the warning. I wasn't calling into question that people would be negatively affected by it. I was calling into question the necessity of it all.