Sengoku Basara - Samurai Kings: The Movie

With the fall of Toyotomi Hideyoshi, Japan is once again plunged into chaos as his once subordinate Ishida Mitsunari looks to seek revenge against Date Masamune. Tokugawa Ieyasu however seeks a different path despite having once been under Toyotomi's forces. Their fates soon intertwine with Sanada Yukimura's and other warriors across the land. With a new unknown threat looming over the land, all warriors advance to Sekigahara for a final showdown...as a sinister plot unfolds in the background.

Synopsis from Anime News Network