Nagisa, an elite investigator, is appointed to the Narcotics Investigation Division, which is understaffed due to the disappearance of investigators one after another due to the serial disappearance of drug investigators. Nagisa, who is filled with a sense of justice and revenge, recklessly embarks on a solo investigation...Kuroshishi - Gathering information on the Aimoriyama-gumi, he enters the AJITO building alone, but there is a trap! - ! - Nagisa is captured, detained, and given the illegal substance they were pursuing...What will be the fate of elite investigator Mitsuki Nagisa? - ! - !