The main character of the story whom the story revolves around. Introduced as codename Glass Heart, the story is told from her perspective, in her role as a trained Taiwanese Mafia's killing machine. Currently at a young age of fifteen, she appears to have attempted suicide and has survived a heart transplant. Having not regained her consciousness even after a year, she finally awakes and leaves the organization for Shinjuku, in search for answers regarding her dreams during her coma and the mysterious voice within. A stranger in Shinjuku and given a hard time by the yakuza and the events that follow, she found herself at Cat's Eye cafe and meets Umibozu. With the intention of meeting Ryo and the mystery of the XYZ code that she encounters, she is guided by visions of Kaori and arrives at the Shinjuku station. She gradually meets Ryo and a bond unfolds between them.