Uchida was always fascinated by the beauty of her classmate Yuya's mother, Reiko, who didn't seem to have a child of the same age. One day, when I go to Yuya's house as usual, I happen to witness Reiko masturbating. Uchida took a picture of the whole story with a smartphone camera. Later, Uchida, who grasped Reiko's weakness, visits Reiko aiming for Yuya's absence.
