Marina lives with her husband, who is much older than her, and her son, who is a university student. She lives a peaceful life in a blessed home, but it is beginning to take away the joy of being a woman from Marina. Then, she meets her son's best friend, Daichi. He often comes to visit her house, but it is not long before she notices his sharp gaze as an adolescent. Then, one day, Marina accepts his intense desire. Five years have passed since then... and their relationship is still continuing. Daichi has a girlfriend. But the two of them continue to have deeper creampie sex...