Following the events depicted in "The Ten Sacred Swords," the film centers on what’s presented as a division within the Fuuma Clan, resulting in its members turning against one another in deadly conflict. Subsequently, those who survive uncover that these confrontations were orchestrated as part of a scheme devised by an enigmatic and formidable combatant with ambitions to dominate the entire Fuuma Clan. Kojiro, Ryuma, Shoryu, along with others of the Ryufu, then set out to find this instigator and eliminate him.

Source on TMDB