I don't know what rule YuriM talks about but I'd say that so far the story and world building has been coherent and consistent. Story is the classic isekai but the MC is neither a retard nor an unbeatable character which is how many isekai go, he's actually an interesting character. I admit his moral facility to kill of the bat is dubious but that is somewhat explained and is after all presented in ch1 so it's an inherent part of the char and not something that contradict what he's been presented as before so I'm ok with it, I actually find it more hard to swallow how good a strategist he is, I don't think the other characters are stupid at all, and there are quite a few crafty ones so I find it more hard to believe that a modern Japan's guy would know so much about war, his fighting skills are explained but there was no mention to him having strategic education along his martial one. Plot wise I find it quite interesting so far thou it's too soon to tell, I particularly like the approach of the MC striving to make his tale and not accepting how the roles are dealt, most Isekai would just have the MC tag along with whoever summoned them. Also the progression after his escape make sense and don't feel forced. What I don't like is the harem subplot (so far only sub) but at least the women don't just fall for him just because he's the MC.
All in all, it's too soon to tell but it's good thus far and looks promising.
Edit: I don't know what this guy above me is on about, it's the most common thing in manga for there to be a time-skip and a scenery change, how is that inconsistent? are you supposing he stayed waiting to be followed in the border for 2 month? or what would be even more boring, to have the artist draw 60 days of a guy walking through the dessert with maybe nothing happening at all, how ridiculous is that. After the desert he returns to a city which happens to be a port town, again, no lack of logic no cohesion, there is no manga that doesn't change scenery, not even movies are that continuous and jump from one scene, place and time to another.
On the other hand, the second arc does have pacing issues and chooses to not getting into details at some parts, for example, when Ryouma wins two certain people to his side, the manga dedicates 1 panel to the event and doesn't explain how he did it, the novel goes about it for several chapters. Just to get an idea, Ryouma's inner dialogues are about 1/4 (if not more) of.the content of this arc in the novel, there is none in the manga. I'm guessing the artist thought it would be too much text and boring for the manga. Like that it changed quite a bit of material which has more weight in the novel and is also less mature.