Boi, if this doesn't get a harem ending with at least the girls shown so far (c9), I am RIOTING.
Also, author is smart: there's no first girl, since he met the first two love interests at the same and their relationships progressed at the same time. Though I'm afraid that if the author had to choose one girl, it'd be the tsundere, and I absolutely don't want it to go down that route (even though she is a top-tier tsundere and actually likeable, and bear in mind that I loathe tsunderes).