Hiromi Harashima, Yotsuba Bank clerk, age 30, height 173 cm. She believes that banks must invest in business and human potential. With this in mind she strives, gracefully, unhurriedly and at her own pace, to become the ideal banker.

Nozaki Shuhei is a branch manager at Oozora Bank. People like him because of his sense of justice and humanity, but he doesn't have a successful career at work. One day, the branch where he works closes. Nozaki Shuhei receives a promotion and works as an auditor. Working as auditor, he sees corruption and decides to change the bank. He faces opposition from all the way at the top of the company. The CEO, Kyogoku Masahiko, and his associates, Takeda Shingo and Tachikawa Sachiko, try to stop Nozaki Shuhei.