In the Edo period, people called samurai still existed. There was a man who was known as an immortal who could kill hundreds of people. This man was called "Manji". Manji met "Rin", a girl whose parents were killed and who vowed to seek revenge. Rin asked Manji to be her bodyguard on her journey of revenge. Although Manji refused at first, he saw the face of his dead sister in Rin. Seeing that Rin was too dangerous to be alone, he had no choice but to help her. But Rin's enemy is the Itto-ryu group that studies the way of the sword. This also means that a tragic and desperate battle to the death will be forced into a desperate situation for even the immortal Manji.