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.

Hajime Madoka is a special accountant police officer, who has been dispatched from the central government office, to work at the local police station on a “special mission” in order to reduce expenditure as part of the austerity budget. Her meticulous personality and attention to detail means she doesn’t miss even the slightest discrepancies in numbers. Her various proposals to reduce expenses during the investigations causes chaos for the detectives as she tends to approach cases with the unusual mindset of “cutting costs” while reaching the same outcome.