Marina Matsumoto's husband couldn't find a job, so she started a secret side job to support him. That job was working at a soapland. Yielding to the manager's forceful advances, she agrees to "training" and ends up receiving creampie after creampie. Surprised at first, she gradually begins to feel intense pleasure deep inside her vagina. Enchanted by the sensation, she starts craving creampie sex more and more. Rubbing the semen of men other than her husband into her pussy, she reaches climax over and over again. Addicted to this pleasure, she begins walking a new path in life.