Kurozuka (complete) fansub download
A story of obsessive love and constant pursue told over a 1000 year period. Escaping from a brother who had just ascended the throne, Yoshitsune, along with his servant, comes across a house in the middle of a desolate mountain. Oddly enough, only a young woman lives there, who seems to possess a very dark and ominous past.
It starts out with Kurou meeting the beautiful woman by the name of Kuromitsu, thus began a relationship which transcends life and memories. A journey of immortals and those who chase after it. The majority of this story takes place a few centuries into the future where Kurou is separated from Kuromitsu and is left without memories. He then begins a search for answers to as to who he is, why he is unable to die and who was the women he is so transfixed upon.
(summary of manga from Baka-Updates)