New Hotaru The Hyper Swindler 4 (2006)

Original title: 新だまし屋本舗・蛍 ～フランチャイズ詐欺を撲滅せよ～

Hotaru Amami is a private investigator, also manages her own office. With her assistant Yayoi Mizuno, who is a law student, they try to exterminate swindlers target women. One day, Erika, Yayoi’s friend in college, visits her office. She says she is claimed to pay for sample cosmetics that she was given on a street by answering a survey. It sounds it is easy that she just has to take an action of cooling-off. However, this case is complex that it’s planned by a group to make money by eating up women’s dream.