Aki Kitsutaka

As Touru's sister, this character was once a significant figure known as the Burial Doll of Kurogane, having mysteriously vanished after consuming her life force. Her demise was a pivotal event driving Tokiya and Touru's desire to alter reality to reach a world where she still existed. Her swordsmanship, reminiscent of Kurogane Kai's abilities, suggests she was actively trying to impede his actions. She also played a role in protecting others, notably saving Tomoharu and Kanade from danger.