Kay Hiroshi (ケイ宏, Hiroshi Kei), otherwise known as Kay Shiba (ケイ芝, Shiba Kei), is the daughter of Kenji and Ino Hiroshi, and the only child of Kenji who inherited his Tsuji status in its active form. She survived the Collapse thanks to her brother Kentaro, though in doing so he left Hotaru and Akira to die. She has since joined the Six Directions.