A long time has passed since the horrible incident in which she was completely defeated by a huge organization, and investigator Aika has made a comeback. However, that day keeps coming back to her mind... With revenge in mind, she goes undercover alone to gain a foothold, and succeeds in kidnapping and interrogating a member of the Kuroshishi-kai's young men. However, the huge organization Kuroshishi-kai also comes to Aika to recapture the young men... The battle between the revenge-hungry Aika and the dark giant organization Kuroshishi-kai begins again!