A faithful wife named "Misono," living happily ever after with her husband until he goes out of town for about a month. As she thought nothing would happen during those days, but fate had other plans. Her horny father-in-law takes advantage of her loneliness while her husband is away, crossing the line and starting a nightmare that lasts day and night! Despite feeling uncomfortable, her body develops and her heart succumbs to temptation... Happiness becomes a distant memory.

夫一筋の若妻「みその」。幸せな日々を過ごしていたが夫が一カ月ほど出張に行くことに。何事もなく過ぎていくはずの一カ月だったが性欲旺盛な義父の魔の手にハマり一線を越えてしまう。その日から始まる悪夢の日々！旦那がいない自宅で朝も夜も関係なく行われる情事！嫌な気持ちとは裏腹に開発されていく身体と堕ちていく心…。幸せな日常はもう二度と戻らない…。