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In Hoshigawa, names grant protection against supernatural forces. When the Registry erases Sector Nine and its 312 residents, repair worker Kaito Amamiya sacrifices his own identity to save them. Becoming a Witness, he can hear forgotten names, but everyone, including guard Mio Tachibana, forgets him. Hunted by mechanical Collectors and an order signed by his missing sister Yuna, Kaito must rebuild his existence and uncover the truth behind the Seventh Bell.