Haruka and the princes won the graduation competition and are now professional artists under the Shining Label. An invitation arrives from their former school's chairman offering a master course — a recognition that the idol industry is more competitive now and a further step of development is needed. The boys are paired with experienced senpai idols for training, and the senpais each bring something unique and something difficult with them. The cast is larger, the scenarios more complex, and the intersection of romance and music is drawn even tighter than before.