ZEX-206 Mariko Inoue, an 18-year-old from Gifu Prefecture who is self-conscious about her large F-cup breasts, loses her virginity

This is a record of the virgin loss of an 18-year-old college student, 147cm tall and with an F cup, and it's packed with everything from "scary and painful" to "pleasant and pleasurable." Even though she understands it in her head, she strains and resists, and won't let him penetrate her, but watch as this young girl becomes an adult.