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I do not think Hitori classifies as an introvert, because introverts do not lament their introversion. Most likely she has psychological trauma or/and disorder that has symptoms presenting as introverted behavior.
But otherwise this has a chance to be modern K-On
Episode 12:
Finished the show today. I did not watch it past 2nd episode when it was airing, since there was a lot of other stuff, and I was not in the mood for Bocchi. It's... Ok, I guess. I mean it's good, but from the hype around the show I expected more. Even though I am an introvert and do have some level of anxiety, I definitely not one of the people, who associated themselves with her. There were funny moments, of course. I wish there would be more music, too.