Set in a near-future Japan where alien creatures called the Noise pose a constant threat to civilians, this action-packed series centers on two young women who channel the power of ancient weapons through song. After a tragic concert attack bonds high schooler Hibiki Tachibana to a fallen warrior's legacy, she and the grieving idol Tsubasa Kazanari must find a way to fight side by side. The show balances its high-energy battle sequences with a genuinely moving story about loss, partnership, and what it means to carry on for someone you loved.