Every day, bank branches encounter various problems like missing money, information leaks, loan problems & breach of duties. Hanasaki Mai's 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, Hanasaki Mai 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.

赤松德郎是个脚踏实地的小型运输公司老板，一直努力维持公司，然而某天他公司的货车发生轮胎飞脱导致年轻母亲死亡的事件，在警方和媒体都认为他是杀人凶手之时，赤松查出全国都出现类似的事故，全部都涉及大型汽车制造商「希望汽车公司」的汽车，于是赤松为了证明自己无罪讨回公道，只身挑战庞大企业。