Kana Kurosaki was appointed to investigate the serial rapist and murderer X. However, information about X is scarce; not even his name or any background details are known, let alone a decent photograph. Kana's father, Gorou, who had been a special investigator, also dedicated himself to investigating X but died in the line of duty midway through. Kana visits Eiji Kagawa, her father's former subordinate and the man who got closest to X, seeking his cooperation in the investigation. However, this Eiji Kagawa is X himself. Kagawa takes an interest in Kana, uses drugs to take away her consciousness…
