Mei, who has just entered her first year of marriage, maintains a relationship with her husband as workplace colleagues, seemingly living a comfortable and stable life. However, she harbors one secret dissatisfaction—she has never experienced an orgasm with her husband during sex. One day, she receives an invitation from her part-time coworkers and the convenience store manager to join a company retreat. She never imagined that this trip would lead to her first vaginal orgasm. During a drinking party at the inn, intoxicated and overwhelmed, she squirts uncontrollably as her pussy is relentlessly stimulated, gradually transforming into a depraved woman who craves internal orgasms. Here begins the tragic story of a married woman's mind and body being twisted beyond recognition.