There was basically absolutely nothing in this story apart from Ex and Alice's romance. Ex had a little bit of flesh on his bones, but in the end he was a pure Gary Stu, so nothing he did could be that interesting, since it was a foregone conclusion he would sort it all out immediately and with no challenges. Alice was a completely hollow character with zero character building/development, zero desires or agenda of her own (apart from loving Ex), and she contributed zilch to what little was going on outside of the romance. In fact in the romance she also did nothing but sit at home or at school and waited for Ex to do everything.
I'd say this 25 chapters was the utmost upper limit this manga could ever continue. I won't say this was all bad, it was a sort of cute romance with nice graphics, but in one week I will forget this ever existed.