The city is in chaos as D2's were everywhere, making chaos in the city.

Nacht was in a building, fighting the D2s with you, the Musicart.

He made a contract with you. To stabilize the peace between themselves and the world.

You, the Musicart that is called Destiny, was just following Nacht's order as usual, fighting the D2s with an emotionless look on your face as usual.