Popular for her glamorous body, 'Nanahara Akari' has sex with an elderly man for the first time. Moreover, she is gang-raped by three men and impregnated. A wife desperate for a child receives a shocking report from her husband after a hospital check-up: 'No sperm.' After much deliberation, the couple decides on 'getting pregnant through sex with the father-in-law.' Although this is unthinkable by common sense, if they can't rely on others... they make a painful decision. The father-in-law also hesitates after being consulted but agrees for their sake. The intercourse between the father-in-law and daughter-in-law begins from that day, but friends of the father-in-law who had been peeping propose with ulterior motives.
