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.

純の夫婦は子供ができず義父にプレッシャーをかけられる日々。以前から彼女を狙っていた義父はこの事を口実にエロ行為に及ぶ。純は耐えられずイケナイ媚薬に手を出してしまう。次第におかしくなっていく義娘の様子にもお構いなしに、美しい体とマ●コを味わい尽くす義父なのであった。