"The Eight-Tails and the Nine-Tails" (八尾と九尾, Hachibi to Kyūbi) is chapter 468 of the original Naruto manga.
With the Fourth Shinobi World War declared, Tobi leaves. The Kage return to the idea of joining forces to fight Akatsuki. Because of Danzō's actions, Konoha will not be permitted to join them until a new Hokage is found, preferably Kakashi. Although Killer B and Naruto would be valuable assets in the war effort, putting them on the battlefield would make it too easy for Akatsuki to capture them. The Kage agree to dedicate all necessary resources to protecting them both. Meanwhile, B begins to learn how to become a better singer from Sabu. They are interrupted by the arrival of Kisame.