Female investigator Emi Harukaze learns from an arrested drug dealer about a human trafficking operation run by loan sharks. She discovers that Hibino's organization, the Hiryu-kai, is involved as a client in these transactions and goes undercover to infiltrate the loan shark syndicate. Emi takes down one thug after another and rescues a young girl who was about to be sold off as collateral for debt. But her actions soon drag her into a new web of trouble...!