The Chūnin Exams, Concluded…!! (volume)

Synopsis
Sasuke begins his match with Gaara by trying, like Rock Lee, to bypass his defenses. When he too proves unsuccessful, he readies an attack taught to him by Kakashi: Chidori. Just as he uses it to break through Gaara's defensive shield, the invasion of Konoha starts, ending the finals. Orochimaru, the mastermind behind the invasion, takes the Third Hokage, Konoha's leader, hostage and the two begin to fight. As invading forces pour into Konoha, Sasuke pursues a fleeing Gaara. Not wanting Sasuke to get too far away, but not able to follow him personally, Kakashi sends Sakura, Naruto, and Shikamaru to stop him.