What is the name of the Naruto Shippuden episode and, season when it was about Kakashi's childhood?

Can you please tell me the season, the episode number and title. It was about Kakashi's childhood. When Kakashi became a Genin. and he had 2 teammates named Obito Uchiha and Rin. And Obito Uchiha died.The episode had 2 parts, I think the episode sounded like the book of Kakashi or something. So can you please tell me the title, season number and episode number. Thank you !