King of Prism by Pretty Rhythm

Over The Rainbow, a rising idol group, celebrates a successful debut, capturing the hearts of fans and inspiring a wave of new students to join the prestigious Edel Rose academy. As they embark on their journey, the members, including Hiro, dedicate themselves to rigorous training for the highly anticipated Prism King Cup, a competition that takes place every four years and promises to test their skills and resolve.

As excitement builds, a formidable rival group known as Schwarz Rose emerges, adding an element of competition that heightens the stakes. With aspirations to become the Prism King—an honor bestowed upon the idol who can enchant audiences the most—Hiro and his friends must navigate the challenges of rivalry, friendship, and their passion for music.