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Kakashi Chronicles ~ Boys' Life on the Battlefield ~ Part 1 / Kakashi Chronicles ~ Boys' Life on the Battlefield ~ Part 2.Episode 119 Kakashi Chronicles ~ Boys' Life on the Battlefield ~ Part 1: During the Third Great Ninja War seventeen years ago, a 13-year-old Kakashi Hatake is just promoted to Jonin with his mentor, the future Fourth Hokage Minato Namikaze, and Rin Nohara giving him gifts. Only Kakashi's other teammate and rival, Obito Uchiha, forgot to bring a present. Soon after, Minato tells his students of their mission to destroy Kannabi Bridge so they can cripple the ninja from the Hidden Stone Village. Along the way, Team Minato is ambushed by Hidden Stone ninja named Mahiru with Kakashi seeing it as an opportunity to try his newly developed jutsu: the Chidori. However, with Kakashi's attack unable to land a hit on his target and Obito is too frightened to fight, Minato personally eliminates Mahiru. Minato then tells Kakashi not to use the Chidori due to its vertigo effect while criticizing Obito for not being able to act on his words. That night, unable to sleep, Obito learns from Minato that Kakashi's mindset is the result of his father Sakumo Hatake bring ostracized for putting his teammates ahead of the mission. The next day, left in charge as Minato heads off, Kakashi leads Rin and Obito into enemy territory before they are attacked by the Hidden Stone ninja Kakko and Taiseki who abduct Rin. Having accepted Kakashi as leader prior, Obito punches him for putting the mission before Rin as he runs off to save her. When Kakashi tries to stop him telling him what happens to ninja who break the rules, Obito says he does, and that's why he believes that Kakashi's father was a true hero, and commenting that those who break the rules maybe scum, but those who abandoned their comrades are worse than scum, before he leaves.
Episode 120 Kakashi Chronicles ~ Boys' Life on the Battlefield ~ Part 2: After leaving an impression on Kakashi, Obito finds the cave where Rin is being held in before attacked by Taiseki. When Kakashi arrives in time to save him from being killed, losing his left eye in the process, Obito musters courage and takes out Taiseki with his awakened Sharingan. Kakashi and Obito then proceed to rescue Rin, but Kakko causes the cave to collapse in on them. With rocks falling all around the Konoha ninja, Obito threw Kakashi out of the way of a falling rock, which landed on him instead, and crushed the entire right side of his body. Knowing his death is certain, remembering that he still owe his team mate a gift, Obito has Rin transplant his left eye into Kakashi's eye socket. Seeing Kakashi cry over how things turned out, Obito assures him that is a great ninja and asks him to protect Rin. Once Obito's Sharingan is transplanted into him, Kakashi emerges from the rubble and uses a perfected Chidori to kill Kakko. However, more Hidden Stone ninja arrive and cause the cave to collapse further with Obito apparently crushed as Kakashi and Rin are forced to leave him behind. After being saved by Minato, the surviving members of Team Minato lament over losing Obito before they complete their mission in destroying the Kannabi Bridge.