Itachi's Story - Light and Darkness: Moonlit Night Naruto: Shippûden : Season 20 Episode 455

Itachi joins the ANBU and is quickly promoted to captain. But he must report directly to Danzo, and is placed as a double agent to observe the Uchiha clan, who are in the midst of planning a coup d’état. With dissatisfaction rising within the clan, the Uchiha ultimately decide to carry out their revolt, and the fateful night approaches.