During the Nine-Tailed Demon Fox's Attack , Kakashi and many of Konoha's other young ninja were prevented from helping defend the village, instead being confined within a barrier to keep them safe.  Minato eventually saved the village from the Nine-Tails , but at the cost of his and Kushina's lives. After which, Danzō Shimura approached a grieving young Kakashi Hatake, noting that it was Hiruzen Sarutobi 's orders for the children, even high-ranking ninja like Kakashi, to not help battle the Nine-Tails, ultimately preventing Kakashi from possibly saving his sensei and his wife. Convincing an emotional Kakashi that the Third was not best for the future of the village, Kakashi agreed to join Danzō's Root division and spy on the Hokage for him. During a mission, Kakashi encountered another Root member codenamed " Kinoe " who was able to use Wood Release .  Knowing that Wood Release was unique to the First Hokage , Kakashi broke in to the Hokage Residence to see what he could learn about this anomaly. The Third caught him, but freely gave him the information he wanted: Konoha had tried to recreate the Wood Release powers in the past, but abandoned the project for killing too many test subjects. The Third then mused that the Nine-Tails might have been defeated and Minato saved had the research been successful.
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