Meeting (episode 172)

is episode 172 of the Naruto: Shippūden anime.

Synopsis
Naruto comes face to face with Nagato and Konan. Naruto, wanting to confront the problem of their hate-filled ninja world, asks to hear Nagato’s side of the story before coming up with an answer. Curious to hear Naruto's answer, Nagato then tells Naruto about how he met Yahiko and Konan, and how he later came to meet the Sannin.