Yuko, whom Yaya has known since childhood, was his first love. Even now, he frequently visits the Shiraki house, more than half of the time to see Yuko. That's why Yaya noticed her subtle changes. Lately, she seems lonely... On that day, Yaya witnessed Yuko masturbating. Seeing her like that, Yaya strongly wished to comfort her. Of course, Yuko would reject a relationship with her son's friend. So Yaya decided to secretly film her masturbating as blackmail material.
