In a world without music, Echo saw Jimi Stonefree disappear fighting the Earless. Years later, he's built his own Equipment that only "Players" can pilot, such as the amnesiac girl named Mu. The duo's trek to recover her memories could save the world. Special Features FunimationCon 2020: Listeners - Dai Sato and Voice Actor Q&A LISTENERS GIG #01 Special Edit version Textless Opening Song Textless Closing Songs for All 12 Episodes.