In the year 2045, singing has been forbidden. Music is no longer created or performed by humans; instead, a music application called MiucS produces all songs on their behalf. One day, a girl named Seria Aiba hears a human singing voice while out with her friends—something that should no longer exist. Following the sound, she encounters a mysterious presence: a ghost. What appears before her is not an ordinary spirit, but a figure from beyond this world known as a Great Ghost. As Seria becomes drawn into encounters involving Great Ghosts, the psychic organization TERA, and a strange song known as the Possession Requiem, she finds herself stepping into a hidden side of a world that has erased human music. This is the story of how Seria's life begins to change—and the path that leads her toward becoming a ghost herself. (Source: MAL News)

Gloria Private Academy is a school where promising young people gather in all fields of entertainment, including music, art, and sports. In the music department, those who match the talent of great musicians are transplanted with a gift into their bodies and are called by the name of that musician. Beethoven, a young man who was discovered to be compatible after an injury, is one of them. After transferring to the school, Beethoven meets classmates with different gifts and discovers the charm of music, while aiming to win the competition. (Source: Official Site, translated)