Shinobu, whose voluptuous body was overflowing with feminine charm, found herself in the prime of her sensual life. One day, she had a chance encounter with Nagasawa, her son's childhood friend, who had come to visit after a long absence. Nagasawa, a young man at a passionate age, was drawn to Shinobu's seductive demeanor and, unable to contain himself, took the opportunity to touch her between the legs. Seeing this, Shinobu made up her mind to satisfy her pent-up desires with the young boy.