Adaptation of Takashi Noguchi's manga, which in turn is an adaptation of Baku Yumemakura's supernatural romance book. The original story is about a guy named Minamoto no Yoshitsune who lived in the 12th century (Kurou). After losing to his brother Minamoto no Yoritomo, the first Shogun to control all of Japan, Kurou retreats into the mountains. His suicide is recorded in history, but Kurou instead encounters a mysterious, lovely woman named Kuromitsu in her mountain hermitage. Kurou eventually falls in love with Kuromitsu, but soon finds she is hiding a deadly secret. He discovers that he is immortal and lives for a thousand years while Japan transforms into a futuristic society.