Shikamaru's Story, A Cloud Drifting in the Silent Dark, Part 3: Recklessness Naruto: Shippûden : Season 20 Episode 491

Shikamaru and his team are within range of Fushu Castle, where Gengo is purported to be. But they are unable to glean any intel about the man. Learning that Gengo will make a public appearance, Shikamaru and company infiltrate the square, where they see Sai being held captive.