Sayane was a struggling, down on her luck J-Pop idol who gets crushed on stage. After dying, she wakes up in a strange realm where sound is muted and music was once the source of magic but is now long forgotten.

A tyrannical mage wiped all music from history and silenced the realm so that no one could ever oppose him. Small bands of resistance fighters and revolutionaries hide in underground concert halls and cabarets. That is where Sayane winds up.

There, her love of music and people propel her into conflict where she finds fame, glory, and maybe even purpose.

My second submission for Isekai.