Japanese society is full of discernment that will never change. Mai Hanasaki, with no position, no power and nothing to be afraid of, confronts the evils within the bank head-on!

Mai Hanasaki (Mio Imada) works as a teller for a branch of Tokyo Daiichi Bank. Suddenly, she gets transferred to the Tokyo Daiichi Bank's headquarter office. Her job is to fix problems that arise at its various local branch offices. Mai Hanasaki has the type of personality where, if she believes she is right, she cannot keep quiet about it or give up. At her new department, she sees many mistakes that takes place inside the bank, which she never noticed before.—AsianWiki