Even though the art and dialogue has more of a sophisticated and mature flair to it, this feels just as much like a wish fulfilment story as any harem isekai. This creepy old guy keeps creeping on this hot chick who's literally 20 years younger than him that he happened to run into at a festival one time, and despite her firm and repeated signals that she has no interest in him he refuses to take no for an answer. So isn't it oh so very convenient for him that we find out she's not actually disinterested and just putting up a front, desperately trying to justify to the reader what is clearly stalking and harassment? It feels sort of like a romantic movie from the 50s.