The Board of Audit’s Special Investigations Division punishes civil servants who cheat and waste the taxes paid by the hard-working people. The heroine, Shinko, is a daring character who doesn't get impressed by power and influence but mercilessly pursues the scoundrels. She who used to be a swindler and has a difficult personality gets scouted by the division and is paired up with the elite rookie, Kudo who is a graduate of Tokyo University and comes from a family of government officials.