God, this manga is so good. While I do hope at least Inotani shows up, it's probably more realistic that no one does.
Reading the comments about the black hair girl's friends and actually reading the story is interesting, It has such a gap of perception between both of it. To me, the friends just behave as average teenagers, the point is that blond girl has some psychological/social issues, which agravate a little the situation. That's it.
Plus, Umi really is being excessively clingy this chapter, presumably due to feeling guilty for not having seen Shou's exhibit. Really, the only friend of Umi's that's ever been really hostile to Shou is Ibu, and that's clearly because she's jealous. The rest just feel awkward because they don't know how to interact with Shou.
I wonder about the student the teacher told them not to invite. o_O
That was the girl the teacher was comforting about having to repeat a year. Obviously she can't go to a farewell party if she's not actually graduating.