Investigator AIKA has made a comeback after the disgusting event in which she was completely defeated by a huge organization.However, every time she happens, that day goes through her mind... With her revenge in her heart, she succeeded in abducting a young member of the Black Lion Society and interrogating her as a foothold in her solo undercover investigation.However, the huge organization Kuroshishikai also goes to AIKA to recapture the young people... The battle between AIKA, who burns with revenge, and the dark giant organization Kuroshishikai again!