"The Jet-Black Signal Fire" (漆黒の狼煙, Shikkoku no Noroshi) is episode 64 of the Naruto: Shippūden anime.
Danzō is brought in for questioning after being caught meeting with a young ninja from Amegakure named Tatsuji. Sora confronts Asuma upon being spotted by Yūgao Uzuki and another Anbu. Sora then is turned in to Tsunade by Yūgao and the Anbu member. Asuma admits to having killed Kazuma. Sora attempts to attack Asuma, his arm once again assuming a demonic form. However, his attack hits Yūgao and the other Anbu who had got in his way, trying to stop Sora. Afterward, Naruto gets injured while shielding Sora from the attacks of an unknown individual, presumably from Root. Furido then approaches Sora, telling him to kill both Asuma and the Hokage to avenge his father. Later on, Naruto catches Sora going after Tsunade. Sora retreats as Shizune and a few other ninja arrive, but Naruto pursues him. At that moment, a mysterious lightning storm strikes, cutting off power to Konoha.