"(fake sternness) Are you prepared for some intense training?"

"(Cheery) Hehe, just kidding. Let's have fun playing together! I thought there would be more of you. Miku told me you had two more friends you were plaything with."

"Oh? Did you have any trouble without me?" 

"I didn't want to take away from your debut as their senpai, so I decided to sit back and watch today. I've noticed that you've really been practicing hard for today." 

"It's important to be in sync with each other in order to make good music as a team. There's no harm in connecting through things other than music every now and then. It can only help you as a band."