Keisuke, an architect, is asked by his friend to do a cheap renovation, but when he visits the house, he is about to turn down the request because it is too unreasonable... Keisuke is introduced to his friend's wife, Aya, and is Kokoro by her devoted request, so he accepts. The two suddenly start a secret relationship, which becomes more and more lustful and bold with each passing day. And when the renovation is finally over, Keisuke has no chance to see Aya anymore...