The library manga is so good. The main librarian is so hot. Sometimes I wonder if the overexposure to hardcore porn made me see long skirts, long sleeves, collars and alike as more sexy than just normal bikinis and alike. Basically going almost full circle and arriving on the opposite side. Though I suppose the sexiness comes from the assumption that under those modest clothes is actually a good body. If I imagine a granny or a slob underneath then they're not hot anymore. Maybe also the soft look of the clothes has something to do with it (imagine the softness). With nudity the only soft parts are tits, ass, maybe belly, but with loose long clothes its as if the whole woman is soft, but she can still be thin and shapely. Maybe the social element also plays a role: the woman dresses modestly, so I assume she's not a slut and would make a good mother, so the desire to impregnate again swells. It's like indirect fertility. Direct just means giving birth, indirect means actually helping your children survive and start families of their own. I remember hearing that the best way of measuring fertility is the number of grandchildren, not children and it seems to make sense. Her character also seems caring, competent and stern when she needs to be.
tldr; Hayasemaru makes me diamond.
The muscle guy is also a pretty good bro for our main character. Also the manga's name is "books bought with taxes"