On a certain day in a certain month, a direct message arrived addressed to the director. "I'm in an erotic research club with my friends at university, and I'm interested in appearing in an adult video because I want to try various things before graduating." "If you're interested, I'd like you to reply." This message came from a 21-year-old female university student. Intrigued by her activities in this mysterious club, we staff members decided to meet her. Her name is Sasakura Hiyori. She claims to be 146 centimeters tall, but she probably looks even smaller. In the research lab of her "erotic research club," the only one of its kind in Japan, dildos are placed everywhere. "I like this size when I masturbate." She wears plain glasses, and both her voice and height are small. Yet, her innocence makes her seem like a small animal. Cute. We want to know more about this girl. We decided to film at her home as well. Her first time undressing. Shy in front of the camera, her body is revealed. Her underdeveloped breasts and her fully grown vagina are erotic. Just observing her vagina makes it wet. Maybe this girl is kinky. Her first time having sex. The quiet, almost animal-like demeanor from just moments ago is nowhere to be seen—the moment I touch her, sounds begin to pour from Hiyori's lips one after another. "I didn't know I could make sounds like that..." I think to myself, unable to stop breathing or speaking. When I apply her favorite vibrator, her senses skyrocket, and her body reacts honestly. She comes again and again, unable to control herself, soaking the sheets. She's shy, yet she can't resist the pleasure. That contrast is so raw and erotic. I honestly never imagined that a quiet, plain girl with glasses would make so much noise and become so disheveled. This girl isn't just a curious college student. She might be an incredible talent. A 150-day documentary following 'just a kinky girl' as she becomes AV actress Sasakura Hiyori.