After a successful debut, the unit Over The Rainbow inspires a surge in new enrollments at Edel Rose as students aspire to follow their boy band footsteps. Hiro and his comrades gear up for intense training towards the prestigious Prism King Cup, a quadrennial spectacle. Amidst their preparations, a formidable adversary in the form of 'Schwarz Rose' emerges, setting the stage for a heated competition to determine the ultimate Prism King capable of captivating every girl's heart!