Akira Kiyose est un jeune lycéen un peu désabusé après avoir arrêté de jouer au base-ball. Il se défoule régulièrement au karaoké avec son meilleur ami Kazu, en étant persuadé de n'avoir aucun talent pour l'avenir.

Akira, après moult hésitations, se lance dans l'aventure des idols auprès de sMiLea Production. Il fait la connaissance de ses deux futurs camarades de groupe, Chihiro et Banri.

Akira et son groupe sont invités au concert de LEGIT, dont deux membres, Daiki et Eishirô, ont continuellement des échanges tendus. L'occasion pour eux de découvrir ce qui lie ces deux membres exigeants sur leurs propres prestations.

Akira, Chihiro et Banri commencent leurs cours de danse et de chant à sMiLea Production, mais Akira semble plus en difficultés que ses deux partenaires, ce qui réveille en lui de très mauvais souvenirs.

Le nouveau groupe d'Akira, Chihiro et Banri est sur le point d'être lancé. Avec ce nouveau groupe, Lin et Maoto reviennent sur la fin de leur carrière et le lancement de l'agence sMiLea Production.

Le jour J est arrivé ! Chihiro, Banri et Akira ont hâte d'annoncer à leurs followers le lancement de leur carrière d'idols. Mais voilà que la météo s'annonce moins clémente que prévue…

Toute l'équipe de sMiLea Production se retrouve à Hawaï pour un shooting photo. Ce lieu emblématique pour les fondateurs de l'agence rend enthousiaste les jeunes chanteurs, les rendant toutefois moins vigilants.

A few years back, Homare, Izumi, Jun, and Kanata lived together in a share house while working as an idol group, but they were unexpectedly fired. While in a slump, they found and helped Gakuto who had apparently collapsed from hunger and was lying on the side of the road. The four were moved by Gakuto, who came to Tokyo to make music, and his singing. Later on, Izumi is invited by Homare and the others to join a band. But try as he may, he worries about the future, unable to take the first step forward...

JAXX/JAXX's nationwide tour finishes, and during the after-party, Rin and Maoto announce that they have decided to hold sMiLea Production's first-ever joint live performance. While PROTOSTAR is excited for their first concert with a live audience, and LEGIT and JAXX/JAXX get fully motivated, it's decided that they will all perform a song written and composed by Maoto at the joint live show. While the important role of the group's lead has yet to be chosen, a suspicious reporter reaches out to Daiki──!

Confusion hits everyone at sMiLea Production when an article in a weekly magazine states that the person who forced Lin to retire from being an idol was Daiki. The group's lead still has yet to be decided, and there are rumors that the joint live performance will be canceled. But while everyone gets increasingly anxious, only Akira continues to believe in Daiki. Akira does his best to support LEGIT's work and make the joint live performance a reality with persistence and a positive attitude. One day, Akira runs into Daiki at the same school he attends for supplementary lessons...!

Akira's determination to never give up and his unfailing faith in Daiki is conveyed through a game of baseball, and with Daiki's recommendation, Akira becomes the group's lead. With each of their thoughts and feelings connected and united as one, sMiLea Production's joint idol live performance finally lifts its curtains for showtime──!