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.

I, Maehara Maki, struggled to connect with anyone during my high school years, finding it hard to make friends. Then, a turning point arrived. A girl named Asanagi entered my life. Despite being clandestinely referred to as the second cutest girl in class by the boys, she chose to spend her Fridays with me instead of her best friend Amami, who held the cutest girl in class title. In the comfort of my home, we delved into the realm of games, watched movies, immersed ourselves in manga, indulged in junk food—pizza, hamburgers—and guzzled cola, carefree and content. To the outside world, we might have seemed a bit messy, but to both Asanagi and me, it was a cherished, hidden time together. (Source: MAL News)

Ink Nijihara is a girl in high school. Unfortunately her crush Nao Tezuka barely recognizes her. To make matters worse, she is very short. Now Ink meets a duck and becomes a mahou shoujo and teaches Nao english in disguise. (Source: ANN)

Lily Baker, a young English girl, decides to go to an arcade on Valentine's Day. She is determined to win a stuffed animal from a claw machine; but even after attempting it for hours, she is unable to get her hands on the prize. Just as she is about to give up, arcade employee Renji Kusakabe steps in and wins the prize for her as a present to celebrate the special day. Due to her cultural background, however, Lily mistakes his action as a declaration of love! With Lily returning to the same arcade in the hopes of seeing Renji again, the two begin exchanging a notebook to learn more about each other and their respective cultures. This marks the start of a friendship filled with gaming, but that is not enough for Lily, as she swears to make Renji fall in love with her!