With the insurance payout up to millions in yen, there is no end to the people who try to get their hands on the money through illegal means. False claims, faked accidents, faked illnesses and the ultimate worst, murder. It requires the insurance companies to employ people who can see through all the sneaky and underhanded methods, to separate the genuine from the fake claims. One such person is Kashiwagi Natsuko, with her expertise and special skills and she is partnered with Tono Aki, but they are both as different as chalk and cheese. However, with their skills and brains combined, no one can cheat the insurance companies of their money!