Based on the novel from the Hanzawa-series bestsellers writer, Ikeido Jun. Hanasaki Mai is but an ordinary employee of a bank, with zero diplomacy. She doesn't think twice about pointing out her boss' mistakes. Her job is to investigate any wrongdoings in the bank branches. She is the voice of the suppressed staff who are unable to go against their bosses. Her partner is the veteran staff, Soma Ken, whose career with the bank had reached a dead end, no promotions in sight. Together, they resolve all the non-compliance issues at the bank.