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