In their new positions as internal bank inspectors, an old geezer is partnered with a woman who never hesitates to speak up when witnessing wrongdoing.

Every day, bank branches encounter various problems like missing money, information leaks, loan problems and breach of duties. Mai Hanasaki's (Anne Watanabe) job is to go there and fix the problems. She is able to do so, even though she is just a bank clerk without higher level powers. Because of her character, Mai Hanasaki will not keep still when she sees a wrong. She's willing to stand up for the side of the weak, regardless of the relation between the top and bottom factions of the bank.—AsianWiki