In the year 2045, human singing is completely banned, and now an AI app named ‘Miucs’ creates all the songs. During this time, a girl named Seria Aiba suddenly hears the voice of a human singing. While following it, a strange ghost (Great Ghost) appears before her.
After this, Seria’s life takes a different path where she encounters ghostly forces, a psychic organization named TERA, and a strange magical song called ‘Possession Requiem’. Many deep secrets of this world deprived of music begin to be revealed, and this journey further leads Chalkar Seria towards becoming a ghost himself.
