The author switched to cute girls on the cover after volume 1, apparently not enough people noticed the big "this is a romantic comedy" on the wraparound. He also tweeted that if you were embarrassed to be seen buying volume 2 with a cute girl on it, you should buy a second copy of volume 1 and put that on top.
Fair warning, it's pretty hard to read in Japanese because the narrator keeps going off on tangents about the most random scientific crap that I don't even know what it means in English let alone Japanese, especially in the early chapters. Also, if you get volume ebooks or whatever, make sure you track down the inside volume covers. They're only on the physical releases, but they are quite possibly as good as or better than the chapters themselves.
