Note: Dropped after ~4.1 volumes read
I really wanted to like this novel, and it honestly started great. The survival concept, wherein the protagonist has 'Minecraft'-style powers together with a subconscious keyboard-moveset is entertaining and felt original. The fact that the protagonist has sex regularly, even within the same day of meeting said person felt like a breath of fresh air from the thousands of isekai where it takes 15 volumes to hold hands, and unlike some other people think, is completely normal behaviour in the real world. The fact that the girl actually had real ulterior motives behind it even felt captivating. Everything after that really starts falling to pieces.
For starters, the 'mistress' premise from the title lasts about 1 chapter and has literally nothing else to do with the story. In fact, it doesn't even make sense in-world for the MC to become a slave; the premise is to protect him from the beastkin that would lynch humans on sight, ignoring the fact that a) The country they came from coexisted peacefully with humans beforehand, and b) Any humans on that side of the wasteland would likely belong to a country that also coexists with humans. But anyways, I guess the catchy title was worth the bad writing.
The MC becomes too OP too fast. There isn't really a sense of progression, in that he immediately becomes a walking calamity, and anything after that is basically superfluous. Since he immediately joins civilization and shortly after can create fortresses instantly, the 'survival' aspect of the story becomes pretty moot. He also isn't even involved in crafting the stuff. At some point, he can make workbenches and they work remotely, concurrently and automatically. His powers are so OP that he could literally complete every single objective the revolutionaries have single-handedly, but instead he is told to take it easy for reasons beyond comprehension, like preserving jobs for farmers (they were starving until recently) or blacksmiths (they had shit rusty weapons) in the middle of the war.
The worst aspect becomes his harem. Almost immediately, every woman he meets instantly falls in love with him. Which, fine, in-world there are barely no men among them, and he is obviously an extremely good provider, so it would make sense for women to flock to him. However, one has to really stop thinking to think that so many of those strong, powerful women would fall hopelessly in romantic love with him within days of meeting him. But anyways, while at first it felt resfreshing that MC actually has sex, it slowly becomes a curse. He has an extremely large harem, so he has sex daily with multiple women, and for some reason, the author feels compelled to mention it every single time. And you know what, maybe if he went into detail about it, one could appreciate that aspect. Instead, we get the literary equivalent of asking ChatGPT to write a story using a string of smirk-emojis as premise. And, it feels like ~10% of the written words in the book are of the form of '... And we went into bed and well, you know what happened' or girls fighting over whose turn it is.
In conclusion, a good premise, a misleading title, and a bad execution.