Shinobu Oshima, a 50-year-old office lady from the Administration Department, forces younger male employees to work overtime. After a company dinner, she returns to the office and visits a male employee under the guise of checking on him. Intoxicated and emboldened, she initiates aggressive sexual advances. The next day, she witnesses the company president and his secretary engaged in a blowjob inside the president's office. Using this compromising information as leverage, she demands a promotion to department head. Her relationship with the president also begins to deepen.