What defines happiness? A lifelong aficionado of psychology, Ritsu Shikishima—a high‑schooler—often contemplates questions like this while enjoying quiet moments with his friends. His idyllic routine unravels when a muffled voice, tangled in static, begs for assistance. That voice is μ, a cherished pop idol whose melodies begin to wreak havoc on reality. The transformation is swift, turning ordinary smiles into jagged digital masks that pulse with chaotic energy. In front of Ritsu"s eyes, the faces of those close to him warp into glitch‑shaped distortions as μ"s song converts them into Digiheads: savage beings intent on annihilating anyone who starts to perceive the true essence of existence. Each Digihead is driven by a relentless fury, targeting anyone who dares question their reality.
Realizing he has been lured into a digital realm fashioned by μ, named Mobius, Ritsu must rally all others who have uncovered the secret before they are wiped out. His discovery forces him to confront the fragile boundary between illusion and truth. Together, they will wield newfound abilities and armaments derived from their feelings—termed the Catharsis Effect—to confront the enigmatic faction called The Ostinato Musicians while striving to break free.
