Toad Yin. In "Naruto", the fourth generation Hokage Namifeng Shuimen sealed half of the Nine-Tails' chakra in Naruto's body and entrusted Tomo Tora of Mt. Myoboku to guard the seal. Gao Toin made an agreement with the Fourth Generation to possess Naruto's master, Jiraiya, during the sealing period, and to be able to be taken out of the library before the death battle. This seal is to protect Naruto and prevent the power of the nine-tailed demon fox from being used by others.