Episode 81

Vanishing Point: Naraku Disappears is the 81st episode of the InuYasha anime.

Plot
Inuyasha gets to Naraku, manages to break his shield, and begins to battle him, thus freeing Sesshomaru. Inuyasha and Sesshomaru then battles (more or less) together against Naraku, who has to retreat badly wounded, using Rin as a delaying tactic. Inuyasha go to get Kohaku before he can kill Rin, with his friends. Rin is kept in a nearby house, but she and Kohaku gets outside at Naraku's command. Kohaku resist his orders long enough for Sesshomaru and InuYasha to intervene. Sesshomaru, loath to follow Naraku's plan, let the boy go. Kohaku is then taken by Kagura, while Rin rejoins Sesshomaru.

Trivia

 * This is Naraku's last true appearance until Episode 123 -  Beyond the Darkness, Naraku Reborn.