I actually started rereading through all of this a couple nights ago and there's something that's got me really worried
When Manbagi has her sleepover with Komi, she tells the story about the boy she liked in middle school, and how since she never said anything to him he ended up going out with the cutest girl in her class. I'm concerned because this might either be setting up Manbagi trying to make a move on Tadano, which obviously won't end well, or she's going to end up seeing the same thing happen to her again with Komi and Tadano ending up closer. Or it is entirely possible that author might just forget and it doesn't get brought up again who knows
Why can't Manbagi be happy?