Tsukuyomi: Moon Phase is an anime series that follows the story of Kouhei Morioka, a photographer who encounters a young vampire girl named Hazuki while on assignment in a European castle. Hazuki seeks to escape her captivity and enlists Kouhei's help, leading them on a journey filled with supernatural encounters and self-discovery. The series blends elements of comedy, romance, and fantasy, creating an engaging narrative with a unique take on the vampire genre.