The last speech bubble, I tried my best but I really can't suss out what she's really saying. I took a swing at it, from what I could make of it, but I'd appreciate it if somebody could check it.
Edit: I think that it's, relating to the second bubble from Miku, and the line on the next page, she's jealous that Miku will be singing "other songs", since her song hasn't been finished yet.
You see, I became something uneccessary to Master and...SetlistUu... That's wrong, but...*wavering*Master! Please look!I guess I'm no longer needed, right? Since you already have so many fantastic songs and all.Can't finish her compositionYay!The kind who can't admit she's jealousYou are my only Master. At that time-CrumpleSince Master came, I was able to sing.This year's setlist is full of fantastic songs!That's nothing to be impressed over, it's only songs by famous producers.Jealous Since I'm just a low level producerI mean, that's what I meant when I said that, didn't I?
... In other words!