The Day of Departure!! (volume)

Synopsis
Sakura goes to see Naruto at the hospital, though is saddened by the injuries he sustained in trying to retrieve Sasuke. Naruto promises her that he will someday bring Sasuke back, though she corrects him by saying that when that day comes they will bring him back together. Resolving to get stronger Sakura asks to become Tsunade's apprentice, and begins training for the next time she sees Sasuke. Jiraiya, meanwhile, offers to take Naruto away for three years to help him get stronger. Naruto agrees, and after getting out of the hospital sets out with Jiraiya, determined to be stronger by the time he returns to the village. In the intermission between Naruto's departure and eventual return, the story of Kakashi Gaiden is told, explaining how Kakashi received his Sharingan from his best friend, Obito Uchiha.