After their performance at the Black or White event, the idol group IDOLiSH7 is at the peak of its popularity, with offers for various concerts and work arriving daily, much to the delight of the seven boys and their manager. However, as their fame continues to grow, Riku Nanase's health begins to deteriorate due to the heavy workload. With the gigantic idol duo Re:vale showing interest in the group and the reopening event of the Zero Arena approaching, IDOLiSH7: Second Beat follows IDOLiSH7 as they not only struggle to adapt to the challenges of idol life but also face their personal troubles, all while continuously meeting the expectations of their treasured fans.