Kakashi Gaiden

Kakashi Gaiden is a manga that tells the story of Kakashi Hatake as a genin.

Basic Plot
Possibly taking place in the Third Great Ninja War, it consists of a mission in which Kakashi's cell, led by the jonin-ranked Yondaime heads to the Land of Rock to destroy a vital bridge for the Leaf Village's cause.

Kakashi's Past
This manga explains several quirks of Kakashi, including how Kakashi gained the Sharingan, why he has a permanent scar over his left eye, the reasoning to why Kakashi's always late, and, most of all, who Kakashi was talking to in the short scene at the kunai-shaped monument after the Invasion of Konoha Arc.

Characters

 * Young Kakashi Hatake
 * Obito Uchiha
 * Rin
 * Yondaime