Hana Haruna, a contract accounting clerk, has been working hard during her probationary period, hoping to get a permanent position for the sake of the family finances, as her husband has been on leave since last month due to poor health. Hana's workplace is a mid-sized company that was built up in one generation by the current CEO, and the CEO's son is the senior managing director, making it a typical "family-run" company. The CEO's foolish son, who is an admitted big-breasted lover, sets his sights on the bulge of the married contract clerk...