Kohina Hiruko is a 10-year-old girl, who, despite her petty physique, is extremely powerful. Kohina like her father gives off a cruel psyche and will annihilate those that stand in her way without any remorse. She, however, seems to question her father when it comes to ending someone's life, demonstrated when she asks him if she could kill Rentaro Satomi, who was pointing a gun at them at that time, and later when she also repeats repeats the same action with Enju Aihara. 