A director receives a message from a 21-year-old college student in an “erotic research club” who wants to try new things before graduation and is interested in porn. The team meets Hiyori Sasakura, who claims to be 146 cm, wears plain glasses, speaks softly, and keeps dildos throughout the club room while openly discussing her preferred masturbation size. Filming continues at home for her first undressing: shyly she reveals small breasts and fully adult pubic hair, becoming wet from observation alone. During her first sex, a single touch unleashes nonstop moans, and her favorite vibrator makes her climax until the sheets are soaked. The quiet, bashful woman shows extraordinary potential in this 150-day journey from ordinary porn lover to performer.