I certainly hope we're not in the last arc of the series, but it does feel like we're near the end of the story.
I know there's a lot that needs to be resolved, I just hope that, along with the completion of the play, that not everything is rushed through as well. That, the play won't be the climax of the plot. Perhaps this arc is pre-play, we don't know, I think that it's hard to have real expectations for this series, I'm just bewildered by everything that happens, it's all sort of... new? The setting is pretty unusual, I find the characters, the pacing, unpredictable, I don't know what to expect, what could happen, because it could really go anywhere, can't it?
So, there's the play, Touko's issues, Yuu's feelings, how Touko and Yuu's relationship would evolved after Touko becomes aware of those feelings (if she doesn't accept them/there's conflict, Yuu is gonna have to face that too), Sayaka's love life, Maki's role.
I included Maki too cus like, well, he was probably meant to do more, I don't think his part in the story is limited to just their conversation at ch16(?). His advantage is pretty much that he's the only one aware that whatver ambiguous relationship between Yuu and Touko is going on, so he could actually be someone that Yuu can confide in (+he's in a neutral position). Yuu's pretty deep into all of this, her perception of Nanami and herself, what's going on, is becoming pretty biased and inaccurate. I think that the chapter where she incorrectly assume how Nanami felt (chapter 10? about Nanami's motivations) was a good indicator of that, that what she thinks she knows isn't always accurate, that she overestimates herself.