In a future where artificial intelligence governs nearly every aspect of society, the world’s first autonomous humanoid AI, Vivy, is a songstress programmed to bring happiness through her music. Her routine performances at a theme park are disrupted when she receives a mysterious message from a fellow AI named Matsumoto, who claims to be from a century in the future. He reveals a chilling prophecy: in just one hundred years, a devastating war between humans and AI will erupt, wiping out much of the population. To prevent this catastrophe, Vivy must embark on a perilous mission spanning decades, using her unique position to alter key historical events. This sci-fi anime blends breathtaking action with poignant emotional drama, exploring themes of consciousness, purpose, and the meaning of a soul. As Vivy struggles to reconcile her directive to sing with her new duty to save humanity, she encounters a diverse cast of characters—including the brilliant scientist Yusuke Kobayashi and the determined programmer Junichi Suwabe—who shape her journey. The series masterfully weaves together time-travel intrigue, philosophical questions, and stunning musical performances, creating a captivating narrative about what it truly means to live.