Blade of the Immortal - S01

Manji is a notorious swordsman in feudal Japan known as the "Hundred Man Killer" for having killed one hundred innocent men. But there is something even more terrifying than his dark reputation: he is immortal. This is the work of Yaobikuni, an eight-hundred-year-old nun who placed bloodworms in Manji's body that can heal almost any wound. To atone for his crimes, Manji decides to kill one thousand evil men. Yaobikuni agrees to this plan, promising that if he succeeds, she will lift his curse of immortality. Soon after this promise, Manji meets Rin Asano, a 16-year-old girl who asks for his help in killing those who murdered her parents. At first, Manji is reluctant and refuses Rin's desperate plea. But because she is clearly too weak to do it alone, he changes his mind and agrees to protect her for four years. With this partnership settled, the two set out on a dangerous journey of bloodshed, revenge, and redemption, each pursuing their own reason to live.