24-year-old big-breasted nurse Haruna has two years of nursing experience and was involved in a year-long affair with a 40-year-old university hospital doctor. However, when his wife found out, they were forced to break up, after which she underwent training by older men. Now, she's volunteered to take on the role of teacher—for a virgin boy like you. What started as a casual encounter with the intention of just "doing it once" quickly turns into her getting creampie by your cum.