Kamikishiro Naoko is a third year student at Shinyo Academy, and going out with both Kimura Akio and Tanaka Shiro. Though known to be a kind, happy-go-lucky girl, she often sings Life is Brief. By chance, she finds Echoes collapsed in the street, and is compelled to help him. Despite his inability to communicate effectively via speech, Kamikishiro finds that she shares a telepathic link with him, and learns of Manticore. It is suggested that Kamikishiro saved humanity through the compassion she showed Echoes.