Long black-haired college student Yui is a virgin. But she has actually masturbated before. In fact, she does it three times a week. She uses AV, manga, or fantasies as material for her self-pleasure. Wanting to experience the kind of lovemaking that couples do, she decided to lose her virginity this time. Her clitoris is already developed, but her hole is not. When it came time to insert, she got scared. She managed to insert it, but it looked very painful. After experiencing her first penis, first sperm, and first sex, she became an adult woman.
