The story goes back to right before the start of the final rounds of the Chunin Exam. As Naruto trains in preparation for his upcoming match, he hears Jiraiya speak of “the Fourth Hokage’s legacy.”
G-Guy Sensei, your face is scary.
غـ-غاي سينسي، وجهك مُخيف
Учитель Гай, вы сами меня пугаете.