Black Tomb

Kurozuka (黒塚?, lit. "Black Tomb") is a novel and Japanese manga series written by Baku Yumemakura and illustrated by Takashi Noguchi. The manga was first serialized in the Japanese seinen manga magazine Super Jump starting in 2003 by Shueisha and ended in December 2006. An anime adaptation by Madhouse was announced by Japanese anime television network Animax in May 2008 and ran between October and December 2008, spanning a total of 12 episodes.

Plot
The original novel is about a 12th-century man named Minamoto no Yoshitsune (Kurou). Kurou flees into the mountains after losing to his brother Minamoto no Yoritomo, the first Shogun to rule all of Japan. History records that he committed suicide, but instead, Kurou meets a strange, beautiful woman named Kuromitsu in her mountain hermitage. Eventually, Kurou falls in love with Kuromitsu, but then realizes she conceals a dark secret. He learns that he is unable to die and continues to live for a thousand years as Japan evolves into a future society.