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This happen in the manga, the Kakashi Giaden series. In Kakashi’s Gaiden,
it’s revealed that Kakashi was the fourth Hokage’s former student, along
with Uchiha Obito and a girl named Rin.
In Kakashi’s gaiden, it’s a story about Kakashi and the mystery behind how
he got his sharingan.
Kakashi was similar to Sasuke in his youths. He even said, ‘Ninja’s who
doesn’t follow the rules are trash’ to Obito. Later though, it will be
revealed that Kakashi’s father died because saving his comrades’ lives
instead of finishing the mission. Kakashi’s father was blamed by the village
and even the friend that he saved. So Kakashi now follows all the rules, and
his first priority is his mission.
When a mission goes wrong and Rin was captured by the enemy, Kakashi was
still persistent to continue the mission and leave Rin behind, but it was
Obito who said to Kakashi that Ninja’s who doesn’t follow the rules are
trash . . . but ninja’s who abandoned their friends are lower than trash. So
then Kakashi and Obito decided to save Rin.
When they tried to save Rin, his left eye got blinded by the enemy, and they
were also trapped by falling rocks that the enemy caused and the falling
rocks fell on top of Obito’s right side of his body. Kakashi tried
desperately to save Obito, but it was no use.
Obito said that he didn’t give Kakashi anything when Kakashi became a Jounin
(yes he was already a Jounin at that time), and Obito decided to give
Kakashi his undamaged sharingan with the help of Rin’s medical jutsu.
Since then, Kakashi’s been living in guilt about Obito’s death, and his
priority now is as we know it, team work and friendship.
Kakashi’s always late when he has an appointment with team seven because he
spent most of his time at the memorial beside the training ground. Obito’s
name’s carved here, so Kakashi often comes here to think about how foolish
he was when he was young and that’s why he always late when he has an
appointment with team seven.
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