It all began ten years ago. D2s attacking Boston, a blood-soaked concert hall: The incident known as the Boston Tragedy. The conductor who lost his life in that tragedy was none other than Kenji Asahina, Takt's father. After losing his father, the boy decides to devote himself to playing the piano and he lets his rage play through his melodies. The one who took care of him was a girl named Cosette, who looked just like Destiny.
I know Cosette always goes too far,
،أعلم أنّ كوزيتّو تتمادى دوماً
Cosette schießt zwar immer über das Ziel hinaus,
aber wir sorgen uns nur um dich.
Cosette siempre se pasa de la raya,
Cosette tiende a pasarse de la raya,
Ma foi, même si Cosette
ne mâche pas ses mots,
So che Cosette esagera sempre,
A Cosette sempre fala
mais do que deveria,
И, да… Козетта, конечно, 
иногда слишком резка…