Histoire
Naruto, Shikamaru, and Sakura are executing their mission of delivering a lost pet to a certain village. However, right in the midst of things, troops led by the mysterious knight, Temujin, attack them. In the violent battle, the three become separated. Temujin challenges Naruto to a fight and at the end of the fierce battle, both fall together from a high cliff. Furthermore, Shikamaru, having been left behind, beholds a giant moving fortress as it appears before his very eyes.
Synopsis via AniList (en anglais).