Because we will soon get another girl cosplaying, and she is probably the worst girl if i remember right.
I still feel salty this story had to introduce Mikari as a love interest, because she's easily the best for me, but like all harems , if you're not the first girl, you really don't have a chance most of time.
i would prefer male rival in this situation instead of harem. why its always need to be freaking harem. Thats why i love so much Sono Bisque Doll - no harem shit, just pure fluff (i hope it stays this way)