In a series of missing narcotics investigators, elite investigator Mitsuki is assigned to the understaffed narcotics investigation department. Mitsuki, burning with a sense of justice and revenge, recklessly embarks on a solo investigation... She gathers information about the Kuroshishi-kai Moriyama-gumi and enters the AJITO building alone, but there's a trap there!! Mitsuki, who is caught and restrained and administered the illegal substance they were pursuing... What will become of the fate of elite investigator Mitsuki Nagisa!!!