"The Nine-Tails' Chakra, Freed!!" (九尾チャクラ、開放!!, Kyūbi chakura, Kaihō!!) is chapter 505 of the original Naruto manga.
Summary
Naruto Uzumaki completes his training of controlling the Nine-Tailed Demon Fox inside of him. Before Yamato, Naruto, and Killer B leave, Naruto senses Kisame Hoshigaki inside Samehada. Samehada springs into action but Naruto used his right hand to smash Kisame. Meanwhile, Might Guy arrives to the Falls of Truth. He starts to go into the Falls to confront his true self. His true self starts to appear behind the waterfall and ask Guy why he keeps on talking about the power of youth. Guy is furious and demands that his true self confront him. The true self is about to appear when Kisame bursts through the waterfall. Guy thinks that Kisame, a "bizarre bug", according to Guy, is his true self, and begins to fight him.
