"Hell" (地獄, Jigoku) is chapter 605 of the original Naruto manga.
Summary
As Kakashi releases Rin from his grip, both he and Obito watch her die, causing them to awaken their Mangekyō Sharingan. As Kakashi passes out, Obito flies into a fit of rage and disbelief which catches the attention of the Kirigakure ninja. Wooden spikes begin to grow from Obito's right side as he commences his assault. Mercilessly, Obito uses a combination of Kamui and Wood Release to kill all the Kiri-nin on the battlefield. Amazed that the young Uchiha could already use Wood Release, Spiral Zetsu noted that he now knew why Madara had chosen the young man. Realising that they could not win, the Kiri-nin decide to pull out but not before retrieving Rin's body. Obito, who was not about to let any such thing happen, slips through several more Kiri-nin and then slaughters the ninja that had tried to retrieve Rin's body. All the while questioning where he was, a blood-spattered Obito uses one final Wood Release technique to kill the other ninja, and comes to the conclusion that he must be in hell.