Mika feels loved by her husband and eagerly anticipates starting a family. She marks her "ovulation days" on the calendar, counting down excitedly to intimate moments with her husband. One day, her husband brings home his coworker, Oki, who will be staying at their house until a work project ends. But when her husband is away, Oki suddenly attacks Mika, overpowering her with his bare cock. As if playing a game, he begins a countdown—"10, 9, 8..."—savoring every moment leading up to creampie. This shocking turn of events sends waves of turmoil through Mika's heart.