Kasai Belladonna is Blake's little sister . When she and her where members of the white fang Cinder Fall and her companions where seeking to make a deal with Adam Torus and we all know how that ended up . But as they where about to leave Cinder saw Kasai practicing in the fields . Once she was done Cinder felt something inside a warm fizzy feeling that she couldn't explain . When she had returned she found out that Blake and Kasai had betrayed the white fang on a mission . But before they had go away Adam threw one of his katana's witch was meant to hit Blake but instead of hitting her it went into the middle Kasai's back and the blade poking out of the middle of her chest . He thought that he had killed her but she survived and over time it had left a scar where the katana had left it..............