Shizuru Imawano

A mysterious girl who first encounters Kensuke at school, and then corners him in the bathroom. She demonstrates knowledge of the sesshōseki and threatens him with a gun, but then flirts with him. She reveals she has a sesshōseki of her own on a necklace. She is a lively and flirtatious girl but is emotionally closed-off, and gets angry with herself when she gets closer to Kagura and Kensuke, as she is afraid of becoming too involved. She has been forced to kill from a young age, and feels that there is no way out of the path set for her as heir to a criminal organization, explicitly shown after her elder sister, Setsuna, kills their father. She is very competent with a gun, and is shown to have excellent markmanship from when she silenced Kensuke by intentionally shooting at his forehead in an instant with her arms chained together, and only causing a presumably shallow wound on the side of his head. Her hand-to-hand combat ability is equal to Kagura, as the two passed out simultaneously after defeating each other. She is shown to be ambidextrous, alternating a gun and her knife between her left and right hands respectively. (Source: Wikipedia)