Kurozuka is an anime adaptation of the manga series of the same name, which blends historical and supernatural elements. It follows the story of Kuro, a man who falls in love with a mysterious woman named Kuromitsu, only to discover she is immortal. As he becomes entwined in her eternal life, Kuro faces a series of challenges across different eras. The anime explores themes of love, immortality, and the passage of time.