Hanabi, if you truly cared for Ichinose, you wouldn't be trying to sabotage his new relationships. You'd be trying to make yourself better so that he falls in love with you again. You are just jealous at this point.
Minaguchi-san's being slandered by a bunch of otakus. Kinda cringe for them, but it helps Ichinose realize that not everyone he'll meet will be good people. I'm sure Minaguchi isn't that type of person, she just went to Ichinose because he was actually approachable now.
Yukishiro seems so needy for Ichinose. It's actually really cute! Ichinose doesn't seem to realize he's actually charming her.