Mio has been married for six years, arranged by her parents. Her husband, Tatsuro, is an antique dealer and is often away from home buying antiques overseas. He seems to love antiques more than his wife, and Mio feels lonely...

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.