In the midst of his serene high school days, Ritsu Shikishima contemplates the essence of happiness with his circle of friends until a haunting plea disrupts his peace. The once-idyllic world takes a dark turn as the captivating melodies of the pop idol μ distort reality, turning loved ones into frenzied Digiheads. Trapped within μ's virtual realm, Mobius, Ritsu must rally fellow awakened individuals to wield their emotional powers, the Catharsis Effect, against the malevolent Ostinato Musicians. With their lives at stake, they must unravel the truth and battle for their freedom before all hope is lost.