King of Prism by Pretty Rhythm

King of Prism by Pretty Rhythm (キング・オブ・プリズム・バイ・プリティーリズム, stylized as KING OF PRISM by PrettyRhythm in Japan) is a series of movies and the sequel to Pretty Rhythm: Rainbow Live.

Synopsis
The Prism Show unit Over The Rainbow succeeds in its debut. Aiming to become like the boy band, more students enroll in Edel Rose. Hiro and the others begin practice for the Prism King Cup, an event that is held once every four years. However, a rival called "Schwarz Rose" appears... The boys fight to become Prism King, the one who can make girls' hearts throb the most.