Ghost Concert: Missing Songs

In 2045, human singing has been banned, and all the music is created by an app called MiucS. One day, Seria Aiba heard a human voice, started to track it, and discovered a mysterious ghost known as the Great Ghost. After getting involved in the supernatural things, they reached their world. A psychic group, TERA, and a strange song called the Possession Requiem help her to travel in the ghost world. Seria began to uncover the hidden world, and her life started to change in unexpected ways.