Des：Kana Kurosaki is appointed to investigate the serial killer X. However, there is very little information about X. Not only his name, but also his entire background is unknown, and there is not even a formal photo. Kanas father, Goro, was once a special investigator who also worked hard to investigate X, but was killed in the execution of his mission. Kana visits Kaga Eiji, her fathers former subordinate and the man closest to X, and asks him to cooperate with the investigation. However, this Kagami Eiji is X. Kagami became interested in Kana and took away her consciousness with drugs...