If you think this has just been about Komichi, then you obviously haven't been paying attention.
That says to me that you don't remember the end of chapter 3, when Hiro dedicated two pages to the pictures and the names of every member of the class, all of whom we've gotten to know better, and in many cases much better, in the nine years since - that you don't remember how much of a role Komichi's mom has played since the very beginning, when we saw the flashbacks of her making Komichi's seifuku. That you don't remember Tanigawa taking embarrassing selfies, or Touko making cookies, or Neko doing kyudo, or Komichi and Erika and Touko and Ai in Tokyo, or Touko running into her old school friends or Erika's interactions with her dad, or Ai meeting Kao at the festival, or when Togano was first introduced - when she declined to trade seats so that Nawashiro could sit next to Washio - or Hotaru flitting around the school like a fairy, or Shijou coming to terms with being overweight and building up the courage to cheerlead and to try on the bikini, or Riri challenging Komichi to a swimming race, or Minoru out tramping through the forest watching the animals, or Tougeguchi remembering the admission exam or doing that brilliantly illustrated ping pong serve (even though she lost the match anyway), or the wonderful series of chapters as Togano has tried to encourage Hebimori to play guitar, or the Akebi family at the beach or any of the countless other things that have been about someone and something other than just Komichi.
Don't presume to lecture me on this series - I've been here since the beginning -
https://forums.mangadex.org/threads/akebi-chan-no-sailor-fuku.59478/post-3616107
And yes - the relationship between Komichi and Erika has been central. Erika is, after all, the first person she met from the class, in chapter 2.
And to all indications, their relationship is still going to be central. It's just apparently NOT going to be as a couple. or at least not yet. Which is entirely understandable if you actually paid attention and remembered that Komichi has already said that she doesn't even understand what romantic love is supposed to be.
Since Hiro follows a sort of scattershot timeline, we have no idea what's coming next, but it's clear that somewhere along the way in the not too distant future, we're going to get more on Komichi and Erika - that makeover is a pretty significant thing, and they apparently have very different ideas of what their relationship is, so they have some things to deal with. But we're also obviously going to get some details on Neko and her backstory, just as we got a focus a while back on Togano and her backstory. And there's no telling what else we'll get, but anyone who's actually been paying attention for the last nine years (and isn't blinded by yuri goggles) should already know that it's going to be MUCH more than just Komichi and Erika.