Great episode for a mostly recap
Spoiler:
The sing off and the whole back and forth between Ranka and Sheryl was hilarious. I think we can all say that Alto is terrified of both of them.
Though I think the romance thread will find ways to dissect it all and pick a winner. I'm calling it a tie. I love how Sheryl uses singing to communicate her feelings of all sorts though. Best part.
Prince Brera?
Diamond Crevasse was pretty... not good. I'll leave it at that. I actually did really like Megumi's cover of What 'bout my star? though, this just didn't work.