Kitsuki Daigo was a Kitsuki Investigator of the Dragon Clan. His father Kitsuki Tatsuya had investigated a serial killer, and eventually fell in love of Akihime, a geisha who allowed him to believe she loved him. Akihime lured Tatsuya into her confidence and sacrificed him to her new Lord, Fu Leng. Daigo was also killed by the tainted girl while investigating his father's murder. Akihime managed to escape alive after Kitsuki Yuki, Daigo's sister, tracked her down and set ablaze her geisha house.