Kenshin Himura, an assassin from the old wars, the Battousai, and a rurouni who holds a firm belief that the sword should be used to protect people. When he meets a young girl named Kaoru, his dark past comes into realization. As he meets new people, he meets new enemies that are hoping to carry on the generation of samurai assassins. Old adversaries arrive from his blood past as he tries to live the simple life of a rurouni.