Jiro's marriage has been childless under pressure from his stepfather, who constantly harasses him about it. It turns out that Jiro's stepfather had always desired Jiro's wife, using their infertility as an excuse to engage in lewd acts. Unable to bear it any longer, Jiro resorts to giving his wife aphrodisiac without her knowledge. As she becomes increasingly unhinged, he takes advantage of her beautiful body and pussy, indulging in all sorts of perverted pleasures.