Minami is a shy, inexperienced 24-year-old from rural Tohoku who applies and travels to Tokyo hoping to discover how good sex and orgasm can feel. Though withdrawn, she is a striking, tall, powerfully built beauty with J-cup breasts and a swimmer-like figure. She works cleaning restrooms at several commercial facilities because she prefers avoiding people and takes pride in making unpleasant public spaces clean. She has had no boyfriend for ten years and only one sexual partner, a brief online relationship from her student days. Her height and large breasts have long been sources of teasing and insecurity, while her quiet nature left her almost invisible at school—even classmates forgot her name or failed to notice when she was left behind. Previous sex brought more pain than pleasure and she has never climaxed with a partner. Although she masturbates and cums every day, her hidden curiosity drives her to seek her first orgasm during sex and finally learn to enjoy it.