Private detective Hotaru Midorikawa protects women from marriage scammers by using herself as a decoy to defeat them one after another. One day, she has to help her junior colleague Kiyomi...

Last time Hotaru, the brilliant detective, brought a marriage fraud ring to ruin. Now she faces another formidable foe! This time, it's a man named Umeki, who leads a scam and commits all sorts of evil deeds. He's also the man who once deceived Hotaru, leading her to become a detective.