Nora Denucci lives a simple life selling flowers till one day she inherits a struggling but innovative tech company. Unsure why or how, she aims to be a good boss under the guidance and leadership of the company’s newly appointed CEO, Claire Bloom. Symphony Dark is a slice of life Cinderella tale of a girl’s journey to find life’s purpose.

After a millennia of taking souls, Death decides to hang it up and finally get one of those "lives" humans are always talking about. Before he can do that, he has to deal with Ashley; a teenage girl determined to end her life. This leads to an ideological tug of war as the two of them debate the question "who controls your life... and death?"