Samurai X: Betrayal (Trust & Betrayal OVA)

During the final years of the Tokugawa Shogunate, young swordsman Kenshin Himura fights as a deadly political assassin known as the "Hitokiri Battousai." As he loses his humanity to the endless cycle of blood, a fateful meeting with a mysterious woman named Tomoe Yukishiro forces him to reconsider his lethal path and seek peace.