The year is 2045. Singing is forbidden, and an AI system called MiucS creates music in place of people. Seria Aiba, a high school girl who can see spirits, lives quietly under these rules—until one day, she hears a real human voice singing. Following the song, Seria discovers the source: a ghost. Now Seria must decide whether to stay silent or risk everything to bring music back to the world.
E1
While out with her friends, Seria hears singing. The voice belongs to the ghost of the great Cleopatra.
E2
An organization of mediums known as TERA harbors Seria to protect her from MiucS.
E3
Seria joins TERA and visits a part of the Phantom Realm guarded by the ghost of a swordsman.
E4
Seria and Rui are invited into the inner palace to seduce the ghost of Lord Iemitsu.
E5
Seria accompanies Riku to an abandoned theme park overrun with ghosts.
E6
Settei and the girls travel to the Phantom Realm to destroy MiucS' server.
E7
Seria is captured by Nero, and many of her friends remain trapped in the Phantom Realm.
E8
Riku joins a group of witches, while Nero prepares for his concert.