On the day she married her husband, Hinako began living happily with Makoto, her former coworker. Makoto was kind, earned a good salary, and their life together lacked for nothing. Yet Hinako harbored one secret dissatisfaction—she had never orgasmed during sex with her husband. She felt guilty toward him, keeping this longing buried deep inside. One day, she received an invitation from her temporary work assignment's department chief and coworkers for a company retreat. It was on this trip that Hinako would experience her first internal orgasm.