Satsuki Kiryūin/Synopsis

Past
Satsuki Kiryūin was born as the first child of Sōchirō and Ragyō Kiryūin, and was, only months after her birth, used as a test subject by her mother to be successful human/Life Fiber hybrid like herself. However, the painful and torturous experiments failed, leading Ragyō to move on, this time planning to have another daughter and using her as her next subject, exposing her while she was still a newborn. However, discovering Ragyō's true nature and determined to save the child, Sōchirō conspired against her. He showed Satsuki a Kamui they had developed called Junketsu, and told her it would be her wedding dress. Soon after, Sōchirō faked the baby's death during experimentation, then ran away with the child to begin a life of seclusion, raising his daughter away from the evil of her mother, while developing a weapon to sever Life Fibers, the Scissor Blades, and the Kamui Senketsu so that his daughter Ryūko may one day destroy her mother and what she had created.

Satsuki was raised by Ragyō, sent to prestigious schools and trained as a master combatant and leader.