Mugen no Juunin: Immortal

Manji cannot escape the consequences of his violent past, and the power that heals his wounds prevents him from escaping through death. Rin Asano asks him to help avenge her family's murder at the hands of the Itto-ryu, and he agrees to protect her on a journey she cannot survive alone.

Their pursuit leads through rival swordsmen, shifting alliances, and political interests entangled with the Itto-ryu's ambitions. As the distinction between justice and revenge becomes harder to maintain, Rin must confront what her goal demands, while Manji discovers that an immortal body does not make suffering or responsibility any easier to bear.