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Everybody knows it's tough being an idol, especially the girls at 765 Production. Made up of thirteen young ladies, the group constantly attempts to improve its image by taking new promo shots and booking the best gigs possible, whether it's being a concert star or a quirky cooking show guest. Led by the kind-hearted and determined Producer, these talented performers such as twins Mami and Ami, quiet Yukiho, clumsy Haruka and gifted singer Chihaya will do their best to become the best idols around.
Shin Ichijou and seven new students join Edel Rose training school to follow their dreams. They hope to become the next Prism Stars and appear in future Prism Shows. However, a plot lead by Schwarz Rose's Jin Norizuki leads to a threat to Edel Rose's existence. Over The Rainbow goes on indefinite hiatus to save Edel Rose, and the three performers go their separate ways. In order to return a huge debt, Kouji goes to Hollywood to produce film music. Kazuki goes on a street-style quest to rediscover his own origins. Hiro delves into special training to improve himself. In separate locations, the members come to face themselves as Prism Stars.
The 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... Who will become the Prism King, the one who can make girls' hearts throb the most!?