It is quality manga. Plot is kind of interesting. Setting is unique. Worldbuilding is kind of solid. Biggest issue were characters and their interactions. Woman in this story simply goes with the first man they see (novel used "It is socially acceptable" excuse) but this is harem manga, it's usual. Worst part is MC's interactions. He is constantly manipulated, pushed around by others and MC understands it himself and doesn't do anything to change it. It made no sense, felt extremely forced and all those interactions were put there as if to advance plot because author was lazy to write additional chapter. Couldn't go past that.
Novel fleshes everything out, so such things are barely noticeable.