Matsu'o Tsurayaba was a Hand assassin working in Japan. His love, another assassin by the name of Kwannon, worked for an opposing crime boss named Nyorin. Though they knew their respective employers would eventually clash, the two remained lovers, and vowed to fight honorably to the death should they have to. Fatefully, they did. Matsu'o was ordered by the Hand to kill Nyorin, and during his fight with Kwannon, she slipped, and fell from the cliffs they were on to the ocean below. Matsu'o brought her broken body to the labs of the Hand. They were able to keep her body alive, but her mind was shattered beyond repair.