I may be missing something here but I don't get the whole Shiho hate. She runs her mouth, leaves the band, and gets MC to work for her new band to upset Yori. Hmm, hardly major sins in my opinion. People do so much worse in real life.
Especially the manager thing. I mean, why couldn't Yori and MC simply say no? They're such pushovers.
I like this manga mostly for the art anyways and I really wanna see Shiho date Akki. They would look fantastic together.