My bet is Touko going after Yuu now. She was always in love with her.
yuu's big sis would be most likely candidate too
Hmm, true enough. She did say she was on Yuu's side. I just feel like it would be great if someone who has a better grasp on Touko was the one to help. Sayaka is obvious, but Konomi saw through Touko just by her gut feeling after all.
There are many options essentially, I just hope it won't be dragged out too much. Can't hope to have a resolution before the class trip tho.
If we take your theory i'd go this.
Maki, the boy who is in the Student Council.
Don't tell me you guys forgot this guy, who got his own chapter in chapter 7 :)
He wants to make this "play" succeed.