The Fallen Castle

is episode 310 of the Naruto: Shippūden anime.

Summary
Team Asuma succeeds in bringing Shū into custody, where they secure a room at an inn for the night. Elsewhere Naruto continues to act as Shū's double and has a hard time going through his daily duties. As Akatsuki members Deidara and Sasori bicker while nearing their destination, the real Shū gets the opportunity to relax and enjoy things he was previously not able to. However, Naruto's cover is soon blown as Tatewaki and Chiyo realise he was not the real Shū after seeing his fighting skills, and Naruto is forced to explain everything to them when his escape is foiled. However, no sooner is the Land of This assaulted by Sasori's hundred puppets and Deidara's explosive creations. Confronting Sasori and reprimanding him for his actions, Tatewaki noted that even though the daimyō for the country was dead, his allegiance to him was never-ending. Ultimately Tatewaki lost his life, having been poisoned by Sasori's Puppet Technique: Prosthetic Arm Senbon technique. Later, as the Akatsuki members pull out, Yamato watches from a distance noting that overall the mission went well. Back in present time, Tatewaki learns that Chiyo and Shū were safe and moving around with the other daimyō under the protection of the Daimyō Protection Squad. Relieved to hear this Tatewaki stops struggling and though wishing he could see them once again, his soul is released to the afterlife, and his body begins to crumble.