Natsuko, a close friend of my mother's since school days, came to stay at the Sato family. His son, Satoru, is drawn into the charm of Natsuko, who is full of adult charm. When she finds out that Satoru is still a virgin, Natsuko gently tells him, "I'll be your first woman." Nervous and confused, Satoru successfully graduated from being a virgin, and like a newly learned monkey, he wants Natsuko again and again...
