According to Madara Uchiha, the Two-Tails first came into being near the end of the waning days of the Sage of the Six Paths' life; to prevent its resurgence, the Sage split up the demon's chakra of the Ten-Tailed Beast into nine separate, monstrous constructs of living chakra, which would become known as the tailed beasts. Like the One-Tailed Shukaku, many people believed that the Two-Tails was once a human that turned into a living ghost (生霊, ikiryō). The Two-Tails eventually fell into the possession of Kumogakure and sealed into a two-years-old Yugito Nii. She was placed into a detestable training program in order to learn to control the Two-Tails' power. After Akatsuki fell, it became captured by Kitigakure and sealed within Kenji.