Following their performance at the Black or White event, the idol group IDOLiSH7 is at the pinnacle of their fame, with offers for various concerts and work pouring in on a daily basis, much to the delight of the seven lads and their manager. However, as their renown grows, Riku Nanase's health begins to deteriorate owing to the tremendous strain. With the massive idol duo Re:vale showing interest in the group and the upcoming reopening event of the Zero Arena, IDOLiSH7: Second Beat follows IDOLiSH7 as they struggle not only to adapt to the challenges of the idol life, but also to face their personal troubles, all while meeting the expectations of their adoring fans.