Jin Norizuki was the former supervisor of Edel Rose and a antagonist of the PRRL.
He later it reveal that he caused Hijiri Himuro injury to be Prism King. Because of everything he done Kō made him no longer supervisor of Edel Rose and had him nothing to do with Prism shows ever again. Later in the final episode, he vowed that he'll take Edel Rose down, as well as the Prism Show.
He also had a spy that messed with the list of Over the Rainbow Session so that Edel Rose can take the crown but soon his father, Kō, issued a new list.