Manji is one of the most skilled samurai in all of feudal Japan. He is also immortal, condemned to a life of combat until he spills the blood of a thousand evil men. But along with eternal life comes the need to make an eternal living, and so manji works as a bodyguard for Rin, who seeks to personally avenge her father's murder at the hands of one of Japan's deadliest swordsmen, Anotsu Kagehisa. But with Manji's instruction and her own burning thirst for retribution, can Rin ever stand against such a powerful and ruthless adversary? And in her quest to kill Anotsu, does she risk becoming more like him?