Yui, a first-year in the workforce, falls prey to her lecherous boss, who performs cunnilingus and inserts a golf club into her from her very first day at work! She is tricked into thinking it is for the development of a bra, and her breasts are exposed in front of the other employees. They all lick her all over and give her a forced tit job! She is sent out on a sales call, and when she visits a company, her breasts are sucked and she is forced to insert something! When she gets back to the office, she is sexually harassed by two of her coworkers in the kitchen! All of this is caused by her overly voluptuous L-cup breasts, and something awakens inside Yui!