Music is the light that illuminates people's hearts-- and that "light" was suddenly taken from the world. The world changed the night the black "Kuroya Meteorite" fell. Grotesque monsters known as D2 emerged from the meteorite and began to overrun the land and people. As the D2 were drawn to melodies people played, eventually "music" itself became taboo. 
 
However, those who opposed the monsters appeared. They the "Musicart," girls who draw power from music. They possess the great operas and musical scores of humanity history and use them to defeat the D2.
 
(Source: Crunchyroll)

Based on the Takt Op. Destiny anime, and the story is told from the viewpoint of Anna Schneider.

Let us begin... 
Fight for life and regain our joy!
 
This is the prequel story to the game takt op. Symphony, featuring the musicart "Joy"!
 
The musicart Joy, who has the power of music in her body, and Franz, an ordinary human soldier, did not get along at first.
But they must work together to fight "D2," the entity that brings about disaster...
 
(Source: ComicWalker, translated)

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