This manga has an interesting premise because everything plausibly has more to it than first appears. There's always a few extra layers to a situation that the reader won't at first suspect, and the protagonist sees these layers not because of some innate "I'm so incredibly smart" sensibility that so many protagonists fall victim to, but because she's seemingly just been around in this world for ages and experienced many of these things firsthand. She's clearly got abilities that far exceed those of an average person, but these abilities are employed in a way that seems natural to the situation. Altogether, it paints a picture of a very different isekai experience, where the isekai part stopped being the focus of the protagonist's life long ago.