Tsukasa had to go on a business trip with Abe, her boss whom she despised. Abe was rude, despicable, and the most lecherous person she had ever known. During dinner with clients, he even reminded her to invite them, showing off her cleavage for the clients to admire. When she mentioned that she might miss the train back to Tokyo, Abe assured her that he would change to another ticket to catch the last train back. However, after everything was over, he did not change the ticket and blamed everything on her. Now there were no more train tickets available to buy, and even the hotels had no more rooms. Luckily, one of the clients owned a hostel and helped them find a room. But the room had no air conditioning, and it was even a single room! With no other options, Tsukasa had to share a room with the detestable boss, and it turned out to be her worst birthday ever. She did not know that Abe had his own plan. While she was taking a shower, he drugged her drink and made her drink it. And after she fell asleep, he began to take advantage of her, recording everything and making her serve him all night long...