ゴーストコンサート: missing Songs

High-schooler Seria Aiba lives in a 2045 where human music is outlawed and an app called MiucS handles all songwriting and performance. When she hears someone actually singing, she follows the impossible voice to a 'Great Ghost' from beyond this world. As a medium she ends up possessed by the spirit of Cleopatra, and a run of supernatural song battles begins.