Mai joins Tokyo Daiichi Bank's internal inspection department, where she reunites with a former colleague. They head out for their first assignment.
Letters of protest from women who paid large sums to a suspicious marriage agency financed by the Aoyama Branch prompt Mai and Soma to investigate.
A delighted Mai looks forward to helping with bank teller duties at the Kamata Branch until she realizes how cruelly the branch manager treats others.
A young, promising bank employee vanishes without explanation. As Mai and Soma look into the disappearance, the man's mother bursts into the bank.
A bored Mai jumps at the chance to visit the branch where she used to work, but a startling bank inspection gets underway just as she and Soma arrive.
After a story alleging sexual harassment from a branch manager appears in a weekly magazine, Mai and Soma are tasked with finding the accuser.
After a friend plays matchmaker and introduces Mai to a handsome restaurant owner, one of his employees approaches Mai with concerns about bribery.
An elderly friend sets Mai up with a charming banker. But Mai grows suspicious of his intentions toward her friend when his bank files for bankruptcy.
As the bank closes in on a long-awaited business opportunity with the powerful Itami Group, Mai clashes with the haughty son of the group’s chairman.
When crucial salary data for Itami Group employees abruptly disappears before payday, the bank assigns Mai and Soma to the investigation committee.
Mai and Soma visit the Nihonbashi Branch to investigate a customer complaint, but the disdainful branch manager shows no interest in cooperating.
On a routine bank visit, Mai and Soma run into Soma’s conflicted former subordinate who needs advice with handling a troubling loan repayment case.
After 3 million yen goes missing, Mai and Soma notice something suspicious while checking security camera footage during an emergency inspection.
Mai and Soma step in to help investigate a stalking case involving a female bank employee whose superiors don't take her safety concerns seriously.
When Soma’s former classmate asks him for loan advice after catching up at an alumni reunion, Soma introduces him to Matsuki at the Gotanda Branch.
Mai and Soma help with a credit examination checking the Fukagawa Branch's finances for errors under the watchful eye of the so-called Branch Crusher.
An unknown woman contacts the Gotanda Branch requesting a finder’s fee of 1 million yen for returning a bank customer's confidential credit file.
As Mai and Soma investigate mysterious attacks on branch managers, they find something the victims have in common and shed light on a past incident.
When a promissory note for 10 million yen vanishes, Mai and Soma notice something odd while retracing the steps of the employee in charge of it.
Mai and Soma visit the Toyosu Branch to follow up on a threatening internet comment. At the end of an otherwise uneventful workday, a fire breaks out.
As a recent bankruptcy sends shockwaves through the bank and a whistleblower alleges bribery, Mai and Soma examine Shindo's connection to the scandal.