I'm under the impression Mei is not even trying to become the heroine and that's why she got something entirely unrelated. Apparently she was supposed to be the rich lady archetype and yet is a gyaru. I think it's cute that at some point she mentioned "What if Mei wanted to be something else?".
Crossdressing is a convenient and satisfying filling and whatever, yet we need progress, no the repeating pattern of (Misaki is forced to dress up → Hareta gets excited → Kya /// etc, etc). Let's add some more spices and have, if it need to be entertaining, more of the game implications (not of the kind that never leads to anything).
Also, I still suspect all of the heroines have a greater chance of ending up falling for Misaki himself.