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Kawai Tomoki and Komori Yukino have recently started dating. Once during a trip, they punctured a tire on a car and they had to turn to the nearest house for help. It turned out to be the Black Rose Mansion. Mistress Mari slipped them a potion and he wakes up tied up. His boring virgin life is about to take a turn into kinky hentai passion. The girls dominate him and then fuck him. What's going to happen to his girlfriend?