In feudal Japan, Jubei Kibagami roams as a wandering sword-for-hire, scarred by past betrayals and tired of political strife. His apathy is challenged when he rescues Kagero, a lone ninja survivor investigating a deadly village outbreak. Reluctantly drawn into the intrigue, Jubei faces the stone-skinned assassin and the enigmatic Devils of Kimon. Poisoned by a spy, Jubei must uncover the ninja group's secrets to save himself and untangle a web of conspiracy threatening the government. As he delves deeper, he confronts old foes and a shocking revelation from his history.