Here we go. Unlocked the Omega Quintet Promotional Video System! Haven't gotten into it yet, but it looks like a very extensive editor for creating stage performances for the group. You can assign vocal parts, choose dance moves and poses, decide who stands where on stage, and even choose which members perform, along with deciding who the camera focuses on for each part. It's the idol simulation game within the game!
As I progress in the game, the group will expand from a trio to a quintet (as implied by the title), and I'll eventually unlock more songs, dances, and outfits to incorporate into the PVs. Definitely looking forward to exploring this part of Omega Quintet even more.