The popular novelty band "Mountain Horses"... When "The Quartet" came to Japan and sold out the Nippon Budokan in June, the 41st of Shinka Era, they were playing as the opening band. Once the concert starts, the souls of the young people become liberated by the power of music. Is that the superhuman power that "The Quartet" has? Each of the Mountain Horses members who came into contact with them gain supernatural powers, but they were only usable for comedic purposes. Eventually, a conspiracy starts to progress, revolving around the superhuman powers that started to appear among the young people.