Naruto: Who made him a ninja

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Konoha 52th year.
After the Third Shinobi World War ended, the Fourth Hokage and his wife passed away, and Orochimaru also left Konoha.
The boy, who was brought into Root by Danzo when Kabuto Yakushi volunteered, fell into deep thought as he looked at his systematized mission.
.......
Years later, countless people roared in anger: Who was it? Who made him a ninja?!