King of Prism by Pretty Rhythm

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 others begin practice for the Prism King Cup, an event that is held once every four years.

However, a rival called Schwarze Rose appears.

The boys fight to become Prism King, the one who can make girls' hearts throb the most.