because I was never once shown that Kurokawa cared at all about her friends until they left her alone
Isn't it possible that this is not a problem with the storytelling but actually showing Kurokawa's priorities?
Often the bullied student is just someone for the reader to sympathize with, but in this case she is shown to have some bad sides / hang-ups herself. Kurokawa never thinks or says "I want to spend time with friend A" or "I like my friend B", it's always just "I don't want to be left out". Maybe Kurokawa thinks she is an otaku and therefore should spend time with the otaku group in her class if she doesn't want to be alone.
If we assume the author did this on purpose and didn't just forget to introduce them properly, then Kurokawa does not "suddenly care" about her friends, she only cared about being part of the group (/a group) from the start. At least that is the way I read it, since she had strong opinions on fitting into a role since the beginning, maybe as a way of explaining to herself why "princesses" got special treatment and had confidence.
Edit: TLDR Her "friends" not being introduced might just show that Kurokawa's relationship with them was shallow and she just cared about not being alone, which is also the only thing she explicitly states.
last edited at Sep 8, 2018 9:07AM