Kokuou Uzumaki was born on July 8, secretly in a small settlement to Taiso Uzumaki and Nisou Uchiha. After his birth, Nisou, who was a missing-nin, concluded that she could never fully be apart of his life, as she would continue to be relentlessly hunted for the high price of a bounty placed on her head by not only Konohagakure, but many criminal and mercenary organizations. Taiso greatly protested this at first, but soon afterwards agreed, realizing it was to protect Kokuou. A few months later, mercenary ninja had been investigating Nisou, and where she might be hiding. They had eventually found out of Kokuou's existence and parentage, defeated and overpowered Taiso, and Kidnapped Kokuou, leaving a letter explaining to go towards the mountain that wasn't far away. Nisou was alerted of this, and hurriedly headed towards the mountain. After killing the bandits, Nisou noted that as long as she lives, Taiso and Kokuou will always be in danger. She removed her eyes, and gave them to Taiso, to give to Kokuou if he ever awakens up to the Mangekyō Sharingan, then telling both Taiso and Kokuou that she loves them and to collect all bounties on her head, slitting her throat with a Kunai.
Years later, Taiso had resided in Kirigakure, becoming a wealthy buisness owner. Kokuou had enrolled in the ninja academy, aspiring to become a powerful ninja. His outgoing nature made him popular among his fellow students.