Anna and Kimura are about to get married, but at this time Anna is sent on a business trip, and the person who goes on a business trip with her is Yoshino from the sales department. Yoshino and Anna used to be in love before, but he wants to marry the daughter of a director and continue his clandestine relationship with her. Unable to accept it, Anna broke up with him immediately. But Anna didn't know how evil and despicable Yoshino could be. Taking advantage of this business trip, he only booked one room, and she had to spend the night in the same room with him. Not only that, he also put aphrodisiacs into Anna's water, making her go crazy, lose control, all night long just hoping for him to fuck...