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In a coastal town, middle school student Kise Utagawa lives with a hidden talent for singing that can put people to sleep or even make them lose consciousness. After an incident where her voice causes a classmate to faint, Kise becomes afraid to speak, let alone sing, leading her into a period of isolation. Her life changes when Isana Nagasu, a new student with a mysterious aura, arrives and encourages Kise to face her fears. Together, they embark on a journey of self-discovery, where Kise's voice becomes a bridge to understanding her powers and her place in the world.