Naruto. Naruto. Book 12. Meeting After the Separation!

The meeting on the Tentei bridge did not go as planned... The mysterious spy turned out to be none other than Kabuto. He had long stopped obeying the "Dawn" and acted solely in the interests of his master – Orochimaru,... who soon appeared on the bridge himself. Seeing his long-time enemy, Naruto lost his head. He didn't even try to control the power of the Nine-Tails and ended up taking the form of a demon fox. In a grand and horrifying battle, there was no victor. Naruto came to his senses only
thanks to Commander Yamato's technique. Meanwhile, Sai proposed Orochimaru a deal... Is it possible that the newcomer, who had fervently defended the Leaf Village, decided to betray the village?..

The twelfth book includes chapters 300–329.