Synopsis

A silence had fallen upon the world, a truce declared between humanity and the D2s. Music was forbidden; melodies were relics of a forgotten past. In what remained of America, a boy born into this muted world heard a sound he couldn't comprehend – the music of a piano. A young man with dark hair, named Takt, was playing. Drawn by the melody, a grotesque D2 and a girl wielding a sword appeared, as if compelled by the sound itself.