Following their performance at the Black or White event, the idol group IDOLiSH7 is at the height of its popularity, with offers for various concerts and work coming in every day, much to the joy of the seven boys and their manager. However, as their fame continues to rise, Riku Nanase's health begins worsening 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 coming up, IDOLiSH7: Second Beat follows IDOLiSH7 as they not only struggle to adapt to the challenges of the idol life but also to face their personal troubles, all while continuously meeting the expectations of their treasured fans.

U.C. 0097, one year after the opening of Laplace's Box. Despite the revelation of the Universal Century Charter that acknowledges the existence and rights of Newtypes, the framework of the world has not been greatly altered. The conflict later dubbed the Laplace Incident is thought to have ended with the downfall of the Neo Zeon remnants known as the Sleeves. In its final battle, two full psycho-frame mobile suits displayed power beyond human understanding. The white unicorn and the black lion were sealed away to remove this danger from people's consciousness, and they should now be completely forgotten. However, the RX-0 Unicorn Gundam 03, which disappeared two years earlier, is now about to show itself in the Earth Sphere once more. A golden phoenix... named Phenex. (Source: Gundam.info)

The threat of the Dead Moon Circus still looms over Usagi Tsukino and the Sailor Guardians. Driven into a corner, the Earth plunges further into darkness as nightmares continue to spread. The Outer Sailor Guardians sense that something is amiss when the young Hotaru Tomoe begins to rapidly age following the total solar eclipse. Believing that their prince and princess are in danger, the four reawaken their powers once more to reunite and aid their fellow Sailor Guardians. Due to the influence of the eclipse, Usagi and Mamoru Chiba's conditions begin to worsen, causing their powers to deteriorate. Without their leader, the Guardians are at a loss as to what they should do next. Frustrated by the situation, Hotaru and Chibiusa set off on their own to confront the Amazoness Quartet, who have been causing the brunt of the chaos thus far. As Queen Nehelenia's liberation quickly approaches, the Sailor Guardians are running out of time to stop her.

Strange suicides have been taking place in New York. One day, four girls from the same high school wake up in the morning feeling tired and dizzy and not being able to remember anything about the previous night. In school, they find out that one of their classmates has committed suicide. School is canceled for the rest of the day, but instead of going home, the girls are drawn to a park by butterflies only they can see. Suddenly a man and a woman approach the girls, telling them that they all died the previous night. (Source: ANN)