Mikako Koyama (22 years old) is an office lady with a plain impression. Why would a girl like this want to appear in an adult video? We met her at a certain station to hear her story. "My body is sensitive, especially my nipples and breasts. I like naughty things. I masturbate at least four times a week," she answered, revealing a shy and perverted girl. So we started filming her, and she revealed that her nipples are abnormally sensitive, and during sex she kept climaxing while shaking her big breasts.