In the 60th year of Konoha, Uzumaki Naruto became a disciple of Metkai, specializing in Eight Door Dungeon. Open the door, the door of scenery, the door of surprise, the door of death. He broke through the chakra points layer by layer and burned away his own existence layer by layer. Memories are worn away, emotions are dulled, old scars from the tiger's mouth are cracked repeatedly, and the thumb unconsciously rubs the knuckles, as if to confirm that he is still alive. In the Valley of the End, Sasuke said, "I can't be the one who forces you to burn your life away." In Yuyin Village, Jiraiya suffered the backlash for him, and his meridians were completely destroyed. After the fourth battle, he knew the price but still opened the door to death. Kyuubi changed "instant death" to "burning for the rest of his life". "Exchange a part of me for all of yours. No matter how you calculate this account, it is a profit."
