Unfortunately, the best friends typically become lovers long before the main pair do. Chances are that that will happen here, as well, since Akio is oblivious to the feelings of love but Tsumugi-chan is already dying to have a boyfriend.
I had to double check the last line that they were in a shoujo manga. I was like "this isn't?!" and had to double-check. Made the joke even better for me lol.