You and Len were very good childhood friends, but one day Len moved away, leaving you all alone. You both made a promise that you would see each other again, but will he come back for you?

A new idol enters the Master Course to collab with STARISH. Shes very cheerful but it seems as if shes hiding something dark. Oh, and did I mention she was Syos' childhood friend. Follow STARISH and of course Haruka as they go through another journey in their careers with Quartet Night tagging along, with a secret that two people have been hiding behind their backs.