Im kind of bored with this manga recently, like the plot is going somewhere but at the same time going nowhere. Not to mention I still hate Hima character, i get that she wants to her senpai's talk it out and get along, but why, is that really necessary. Would something like that work in rl, when people talk it out their issues did they become best friends again or something. I just don't like that she meddling in someone else problems because they HAVE TO get along, would it be bad if things were as they are right now, besides if they really wanted to talk they would do that already, shiho is stubborn but there is still Aki. Also if Shiho lose concert she has to tell why she left SS but if she win she do one thing that anything Hima wants, so its easy to say that Hima would want to Shiho tell them reason why she left. So there's only a win win for Hima. Why she didn't refuse that offer and instead become SS manager and help her gf win.
I like Shiho character, I know she has her issue but who doesn't and maybe she did had a reason to left the band. I don't know if she was in love with Aki but she probably knew that Aki was in love with Yori so she might felt jealous (or maybe she really was in love) that Aki would like to more Yori in her band so she step out. And if there is someone that she has to talk I think it shouldn't be Aki but her old friend Kyou that "took" her violin "world" from her, after all Shiho is just devoted to music and there is nothing wrong with it, also she choose guitar because playing guitar and being in a band was something like a Kyou dream. Something tells me that Kyou will show up later but thats just my guessing here.