Momomiya Ibara lives alone in Tokyo as another corporate drone. Tomorrow starts our protagonist’s dear three-day weekend. However, on her way home from work she is abducted by the mysterious vampire Iris. Ibara gets bitten by the vampire, but the "poison" sliding down his fangs makes her cum nonstop and plunges her into the infinite pleasure of salacious sex. Iris is so good at indulging her in any way he can that Ibara’s heart, frozen by corporate life, starts to melt as she allows herself to surrender her body to him again and again... With these three days and three nights full of pleasure coming to an end, Ibara has a certain revelation. Why did he take her away in the first place?