Battle of the Death inside the Water Prison!! (volume)

is volume 50 of the Naruto manga.

Chapters

 * 464.
 * 465.
 * 466.
 * 467.
 * 468.
 * 469.
 * 470.
 * 471.
 * 472.
 * 473.

Synopsis
Unable to defeat the Fourth Raikage and his allies, Sasuke flees. He tries to focus his efforts on Danzo, but the other Kage intervene and defeat him. Before he can be killed he is saved by Madara Uchiha, who asks the Kage to give him Killer Bee and Naruto so that he can use the tailed beasts to bring the world under his control. The Kage refuse, so he declares war against them. Madara disappears with Sasuke and the Kage decide to join forces against Akatsuki. As they begin preparing for the battles to come, Kisame Hoshigaki elsewhere locates Killer Bee and attempts to capture him. He almost succeeds, but when the Raikage arrives to punish Bee for earlier pretending to be captured, Kisame is killed by the two brothers.