After appearing in the Prism King Cup representing Edel Rose, and getting a glimpse of what it was like to a be a future Prism Star, Ichijo Shin entered Kakyoin Academy’s High School division in spring and became a first-year high school student. Koji, Hiro, and Kazuki from Over The Rainbow left Edel Rose and established a new agency. 
Meanwhile, after having the title of Prism King stolen by Hiro, the leader of Schwarz Rose, Norizuki Jin, proposes PRISM.1, which would decide a new king other than Prism King. He then announces that Schwarz Rose and Edel Rose will be competing with each other. 
(Source: Crunchyroll)

New KING OF PRISM film reconstructing the events of the Prism Show competition, the PRISM.1, shown during KING OF PRISM -Shiny Seven Stars- with added scenes.

A collection of lives from the King of Prism franchise. The best ten live scenes were chosen by the fans out of twenty-eight scenes.
 
Note: Also includes a new scene from King of Prism: Shiny Seven Stars.

Ace Ikebukuro