Among the employees, Yuka is secretly rumored to be the biggest-breasted woman in the office. She is shocked when a male coworker sexually harasses her in the staff lounge. When she tries to consult a senior colleague, she gets propositioned again, and though embarrassed, she begins to feel secretly aroused. While working late, she is sexually harassed by her department manager and ends up being taken by him. Yuka, a plain and shy office lady, is fated to have her large breasts toyed with by her male coworkers.