Kakashi has just been promoted to Jonin, leading to tension with his teammate, Obito Uchiha.
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Naruto Shippuden Episode 119, titled "Kakashi Gaiden ~ A Boy's Life on the Battlefield ~ Part 1," is a pivotal flashback episode. It dives into the backstory of Kakashi Hatake and his teammates under the leadership of Minato Namikaze. Where to Watch for Free