As Dark Horse's description says:
"To end his eternal suffering, he must slay one thousand enemies!" Manji, a ronin warrior of feudal Japan, has been cursed with immortality.
To rid himself of this curse and end his life of misery, he must slay one thousand evil men! His quest begins when a young girl seeks his help in taking revenge on her parents' killers . . . and his quest won't end until the blood of a thousand has spilled!"
In 2008 a lackluster animated series was created, but now we get much better news. Director Takashi Miike, who adapted Ichi the Killer, and directed Audition- has been chosen to helm the live action film adaptation of Blade of the Immortal. This is tremendous news, as Miike knows how to handle horror and the strange aspects of human darkness, so he should be able to pull this off wonderfully.
Blade of the Immortal is slated for a 2017 release with actor and pop-idol member of SMAP Takuya Kimura in the lead role.
Source [ Crunchyroll ]