Blade of the Immortal

Manji is a skilled samurai who has a decisive advantage: no wound can kill him. In the past, his actions led to the death of 100 other samurai. Cursed with immortality at the hand of an 800-year-old nun named Yaobikuni, he is compelled by the death of his sister to accept a quest to end his agelessness and make amends by killing 1000 evil men