Shiho is a talented investigator who solves difficult cases one after another with her beloved husband. One day, her husband goes to investigate the huge drug organization ``Yamakita Rengo'' and comes back drugged and looking like a wreck. Shiho breaks down in tears next to her husband, who dies in his sleep.She vows to take revenge on him and infiltrates the Yamakita Alliance's hideout as a ``courier.'' However, the Yamakoku Rengo uses the anus to safely transport drugs.