What’s happiness? The fan of psychology, queries like this are ones who high school pupil Ritsu Shikishima enjoys to ponder because he spends his quiet days with his pals. This voice goes to μ, a dear pop idol, whose singing starts to have a negative impact on the entire world. Ahead of Ritsu’s eyes, the faces of his family and friends become twisted by glitches because the noise of μ’s voice transforms them to Digiheads: berserk monsters bent on the extermination of those who start to wake up to the true nature of the presence.Recognizing that he’s trapped in a virtual world made by μ known as Mobius, Ritsu should currently collect everyone else that was able to realize the fact before they’re eliminated. Collectively, they’ll use their newfound abilities and weapons given by their own feelings –called the Catharsis Effect–to battle the mysterious group called The Ostinato Musicians because they fight to escape.