Yumi Okamoto steers Nogawa Industries as its business manager, taking charge after the president's imprisonment. She keeps the company running smoothly because the president's son, Taketo, displays no interest in the business. Yumi consistently declines Taketo's romantic advances politely but firmly, suggesting a possible inclination towards relationships with women. Her background includes previously serving as the president's secretary. She maintains connections with the Kitazawa family, though the specifics remain undefined.