Ahh, finally, an Ucchi doujin that isn't creepy or too over the top, it's perfect, I love it.
I'm also pretty sure the bathroom gossiping girls were Kibako's friends and were just shit talking behind her back, pretty sure it has happened in manga too, since Minami keeps going to their class bc no one really tolerates her besides Mako, I can see why Ucchi thought they were talking about her though. With how she keeps going to Tomoko's class and all.
I think the last page were previews for a sequel? I really hope it comes someday, this looks interesting and it was a fun read, finally Emoji isn't depicted as an incredibly creepy single minded sex starved lunatic, like hell, even in the manga Ucchi keeps trying to apologize to Tomoko, so we know she's trying to get better at least and it goes to show that she does care in the end. I hope more good quality doujins like this one keep going, it was nice.