The third act of SOD female employee Koharu Asai. She made her AV debut as a virgin, and sex was painful for her. "I want to have good sex..." she said, and decided to train herself through masturbation for a month to achieve good sex. This is a documentary that follows her growth, suffering, and pleasure as she masturbates in various ways, including with sound orgasms, electric massagers, toys, and blindfolds.