Ok so the Senpai is just Micchi but without knowing what she sees are ghosts and just thinking everyone else can see them. I wonder, if Micchi is so wary of them because in the past even if they looked like people they would reveal a scary face (like the little girl in ch.3), how come it never happened to senpai? How come she acknowledged all the ghosts no matter how creepy they were and not one of them approached her and made her realize others didn't see it?
There is always the possibility this is just like Mieruko-chan, with senpai having powers not as strong as the MC, but why do I feel like this senpai is a walking red-flag (intentionally or not)?
Also it makes me so sad that Kasumi was ostracized by association and now thinks her best friend in class is also avoiding her because of senpai. Aizawa-san's moment of horniness had really bad consequences. But I do hope Honami focuses on trying to find out why it looked like senpai saw her, which will probably happen when Micchi and senpai talk (probably because of the Kasumi's feeling left out in class again issue). How will Kurotori pretend she has no idea the gay ghost of an idol is walking with her every time she's at school?
Honami will probably think: this girl can see me -> I can be seen -> maybe micchi can too -> I'll try to make her notice me (probably thinking she has to do something to be visible, not that senpai and micchi have an ability because bless her soul she doesn't seem very bright, only gay thoughts in her head).